diff --git a/benchmark.zig b/benchmark.zig
index 2692b93..18af7a8 100644
--- a/benchmark.zig
+++ b/benchmark.zig
@@ -1,7 +1,6 @@
 const std = @import("std");
 const dtype = @import("dtype");
 const DBEngine = @import("src/cli/core.zig");
-const ziqlParser = @import("src/ziql/parser.zig");
 const ZipponError = @import("error").ZipponError;
 
 const names = [_][]const u8{ "Alice", "Bob", "Charlie", "Dave", "Eve" };
@@ -28,17 +27,18 @@ pub fn myLog(
     _ = args;
 }
 
+// Maybe I can make it a test to use the testing alloc
 pub fn main() !void {
+    const allocator = std.heap.page_allocator;
     const to_test = [_]usize{ 500, 50_000, 1_000_000 };
     var line_buffer: [1024 * 1024]u8 = undefined;
     for (to_test) |users_count| {
-        var db_engine = DBEngine.init("benchmarkDB", "schema/benchmark");
+        var db_engine = DBEngine.init(allocator, "benchmarkDB", "schema/benchmark");
         defer db_engine.deinit();
 
         {
             const null_term_query_str = try std.fmt.bufPrintZ(&line_buffer, "DELETE User {{}}", .{});
-            var parser = ziqlParser.init(&db_engine.file_engine, &db_engine.schema_engine);
-            try parser.parse(null_term_query_str);
+            db_engine.runQuery(null_term_query_str);
         }
         // Populate with random dummy value
         // Need some speed up, spended times to find that it is the parsonConditionValue that take time, the last switch to be exact, that parse str to value
@@ -46,8 +46,6 @@ pub fn main() !void {
             std.debug.print("\n=====================================\n\n", .{});
             std.debug.print("Populating with {d} users.\n", .{users_count});
 
-            const allocator = std.heap.page_allocator;
-
             var prng = std.rand.DefaultPrng.init(0);
             const rng = prng.random();
             const populate_start_time = std.time.nanoTimestamp();
@@ -77,8 +75,7 @@ pub fn main() !void {
             const null_term_query_str = try std.fmt.allocPrintZ(allocator, "{s}", .{array.items});
             defer allocator.free(null_term_query_str);
 
-            var parser = ziqlParser.init(&db_engine.file_engine, &db_engine.schema_engine);
-            try parser.parse(null_term_query_str);
+            db_engine.runQuery(null_term_query_str);
 
             const populate_end_time = std.time.nanoTimestamp();
             const populate_duration = @as(f64, @floatFromInt(populate_end_time - populate_start_time)) / 1e9;
@@ -118,8 +115,7 @@ pub fn main() !void {
 
                 // Execute the query here
                 const null_term_query_str = try std.fmt.bufPrintZ(&line_buffer, "{s}", .{query});
-                var parser = ziqlParser.init(&db_engine.file_engine, &db_engine.schema_engine);
-                try parser.parse(null_term_query_str);
+                db_engine.runQuery(null_term_query_str);
 
                 const end_time = std.time.nanoTimestamp();
                 const duration = @as(f64, @floatFromInt(end_time - start_time)) / 1e6;
diff --git a/build.zig b/build.zig
index c11dea8..4a1e75c 100644
--- a/build.zig
+++ b/build.zig
@@ -2,7 +2,7 @@ const std = @import("std");
 
 pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
-    const optimize = b.standardOptimizeOption(.{});
+    const optimize = b.standardOptimizeOption(.{ .preferred_optimize_mode = .ReleaseFast });
 
     // Run
     // -----------------------------------------------
@@ -126,6 +126,7 @@ pub fn build(b: *std.Build) void {
     }
 
     // Release
+    // TODO: Make a small, fast and safe release
     // -----------------------------------------------
     {
         const release_step = b.step("release", "Create release binaries for multiple platforms");
diff --git a/lib/zid.zig b/lib/zid.zig
index 9afc6a8..7c7bc5c 100644
--- a/lib/zid.zig
+++ b/lib/zid.zig
@@ -213,10 +213,16 @@ pub const Data = union(DType) {
 
 // I know, I know I use @sizeOf too much, but I like it. Allow me to understand what it represent
 
+const empty_buff: [4]u8 = .{ 0, 0, 0, 0 };
+
 /// Take an array of zig type and return an encoded version to use with Data.initType
 /// Like that: Data.initIntArray(try allocEncodArray.Int(my_array))
 /// Don't forget to free it! allocator.free(data.IntArray)
 pub const allocEncodArray = struct {
+    pub fn Empty() []const u8 {
+        return empty_buff[0..];
+    }
+
     pub fn Int(allocator: std.mem.Allocator, items: []const i32) ![]const u8 {
         // Create a buffer of the right size
         var buffer = try allocator.alloc(u8, @sizeOf(u64) + @sizeOf(i32) * items.len);
diff --git a/src/cli/core.zig b/src/cli/core.zig
index 80c9fba..4a408e8 100644
--- a/src/cli/core.zig
+++ b/src/cli/core.zig
@@ -9,38 +9,48 @@ const ziqlParser = @import("../ziql/parser.zig");
 const setLogPath = @import("../main.zig").setLogPath;
 const log = std.log.scoped(.cli);
 
-const DBEngineState = enum { MissingFileEngine, MissingSchemaEngine, Ok, Init };
+const DBEngineState = enum { MissingFileEngine, MissingSchemaEngine, MissingAllocator, MissingThreadEngine, Ok, Init };
 
 pub const Self = @This();
 
 var path_buffer: [1024]u8 = undefined;
 var line_buffer: [config.BUFFER_SIZE]u8 = undefined;
 var in_buffer: [config.BUFFER_SIZE]u8 = undefined;
-var out_buffer: [config.BUFFER_SIZE]u8 = undefined;
-
 var value_buffer: [1024]u8 = undefined;
-var buffer: [1024 * 1024]u8 = undefined; // For env var
-var fa = std.heap.FixedBufferAllocator.init(&buffer);
-const allocator = fa.allocator();
 
 usingnamespace @import("parser.zig");
 
+arena: *std.heap.ArenaAllocator = undefined,
+allocator: Allocator = undefined,
 state: DBEngineState = .Init,
 file_engine: FileEngine = undefined,
 schema_engine: SchemaEngine = undefined,
 thread_engine: ThreadEngine = undefined,
 
-pub fn init(potential_main_path: ?[]const u8, potential_schema_path: ?[]const u8) Self {
+pub fn init(parent_allocator: Allocator, potential_main_path: ?[]const u8, potential_schema_path: ?[]const u8) Self {
     var self = Self{};
 
-    self.thread_engine = ThreadEngine.init();
+    const arena = parent_allocator.create(std.heap.ArenaAllocator) catch {
+        log.err("Error when init Engine DB allocator", .{});
+        self.state = .MissingAllocator;
+        return self;
+    };
+    arena.* = std.heap.ArenaAllocator.init(parent_allocator);
+    self.arena = arena;
+    self.allocator = arena.allocator();
 
-    const potential_main_path_or_environment_variable = potential_main_path orelse getEnvVariable("ZIPPONDB_PATH");
+    self.thread_engine = ThreadEngine.init(self.allocator) catch {
+        log.err("Error initializing thread engine", .{});
+        self.state = .MissingThreadEngine;
+        return self;
+    };
+
+    const potential_main_path_or_environment_variable = potential_main_path orelse getEnvVariable(self.allocator, "ZIPPONDB_PATH");
     if (potential_main_path_or_environment_variable) |main_path| {
         setLogPath(main_path);
 
         log.info("Found ZIPPONDB_PATH: {s}.", .{main_path});
-        self.file_engine = FileEngine.init(main_path, self.thread_engine.thread_pool) catch {
+        self.file_engine = FileEngine.init(self.allocator, main_path, self.thread_engine.thread_pool) catch {
             log.err("Error when init FileEngine", .{});
             self.state = .MissingFileEngine;
             return self;
@@ -65,7 +75,7 @@ pub fn init(potential_main_path: ?[]const u8, potential_schema_path: ?[]const u8
         };
 
         log.info("Schema founded in the database directory.", .{});
-        self.schema_engine = SchemaEngine.init(schema_path, &self.file_engine) catch |err| {
+        self.schema_engine = SchemaEngine.init(self.allocator, schema_path, &self.file_engine) catch |err| {
             log.err("Error when init SchemaEngine: {any}", .{err});
             self.state = .MissingSchemaEngine;
             return self;
@@ -84,10 +94,10 @@ pub fn init(potential_main_path: ?[]const u8, potential_schema_path: ?[]const u8
     }
 
     log.info("Database don't have any schema yet, trying to add one.", .{});
-    const potential_schema_path_or_environment_variable = potential_schema_path orelse getEnvVariable("ZIPPONDB_SCHEMA");
+    const potential_schema_path_or_environment_variable = potential_schema_path orelse getEnvVariable(self.allocator, "ZIPPONDB_SCHEMA");
     if (potential_schema_path_or_environment_variable) |schema_path| {
         log.info("Found schema path {s}.", .{schema_path});
-        self.schema_engine = SchemaEngine.init(schema_path, &self.file_engine) catch |err| {
+        self.schema_engine = SchemaEngine.init(self.allocator, schema_path, &self.file_engine) catch |err| {
             log.err("Error when init SchemaEngine: {any}", .{err});
             self.state = .MissingSchemaEngine;
             return self;
@@ -129,9 +139,7 @@ pub fn start(self: *Self) !void {
     }
 }
 
-pub fn getEnvVariable(variable: []const u8) ?[]const u8 {
-    fa.reset();
-
+pub fn getEnvVariable(allocator: Allocator, variable: []const u8) ?[]const u8 {
     var env_map = std.process.getEnvMap(allocator) catch return null;
 
     var iter = env_map.iterator();
@@ -150,4 +158,8 @@ pub fn runQuery(self: *Self, null_term_query_str: [:0]const u8) void {
 pub fn deinit(self: *Self) void {
     self.thread_engine.deinit();
     self.schema_engine.deinit();
+    self.file_engine.deinit();
+    const parent_allocator = self.arena.child_allocator;
+    self.arena.deinit();
+    parent_allocator.destroy(self.arena);
 }
diff --git a/src/cli/parser.zig b/src/cli/parser.zig
index 751d87c..dc1299a 100644
--- a/src/cli/parser.zig
+++ b/src/cli/parser.zig
@@ -20,16 +20,14 @@ const State = enum {
 
 const Self = @import("core.zig");
 
-var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
-var allocator = arena.allocator();
-
 pub fn parse(self: *Self, null_term_line_str: [:0]const u8) !bool {
     var toker = cliTokenizer.init(null_term_line_str);
     var token = toker.next();
     var state = State.expect_main_command;
 
-    defer _ = arena.reset(.free_all);
-    errdefer arena.deinit();
+    var arena = std.heap.ArenaAllocator.init(self.allocator);
+    var allocator = arena.allocator();
+    defer arena.deinit();
 
     var last_token: cliToken = undefined;
 
@@ -137,7 +135,7 @@ pub fn parse(self: *Self, null_term_line_str: [:0]const u8) !bool {
         .expect_path_to_db => switch (token.tag) {
             .identifier => {
                 self.deinit();
-                self.* = Self.init(toker.getTokenSlice(token), null);
+                self.* = Self.init(self.arena.child_allocator, toker.getTokenSlice(token), null);
                 state = .end;
             },
             else => {
@@ -196,7 +194,7 @@ pub fn parse(self: *Self, null_term_line_str: [:0]const u8) !bool {
             .identifier => {
                 const main_path = try allocator.dupe(u8, self.file_engine.path_to_ZipponDB_dir);
                 self.deinit();
-                self.* = Self.init(main_path, toker.getTokenSlice(token));
+                self.* = Self.init(self.arena.child_allocator, main_path, toker.getTokenSlice(token));
                 try self.file_engine.writeSchemaFile(self.schema_engine.null_terminated);
                 state = .end;
             },
diff --git a/src/dataStructure/RadixTrie.zig.old b/src/dataStructure/RadixTrie.zig.old
index b7d3895..40b8279 100644
--- a/src/dataStructure/RadixTrie.zig.old
+++ b/src/dataStructure/RadixTrie.zig.old
@@ -2,7 +2,6 @@ const std = @import("std");
 const UUID = @import("dtype").UUID;
 const ArenaAllocator = std.heap.ArenaAllocator;
 
-// TODO:
 // 1. Basic RadixTrie and Node - OK
 // 2. Add one UUID
 // 3. Get one file index using one UUID
diff --git a/src/dataStructure/filter.zig b/src/dataStructure/filter.zig
index 5f9fe2c..733e9e0 100644
--- a/src/dataStructure/filter.zig
+++ b/src/dataStructure/filter.zig
@@ -245,7 +245,6 @@ pub const Filter = struct {
         }
     }
 
-    // TODO: Use []Data and make it work
     pub fn evaluate(self: Filter, row: []Data) bool {
         return self.evaluateNode(self.root, row);
     }
diff --git a/src/file/array.zig b/src/file/array.zig
new file mode 100644
index 0000000..0567c6a
--- /dev/null
+++ b/src/file/array.zig
@@ -0,0 +1,272 @@
+const std = @import("std");
+const zid = @import("ZipponData");
+const dtype = @import("dtype");
+const ConditionValue = @import("../dataStructure/filter.zig").ConditionValue;
+const ArrayCondition = @import("../ziql/parts//newData.zig").ArrayCondition;
+
+pub fn updateData(allocator: std.mem.Allocator, condition: ArrayCondition, input: *zid.Data, data: []ConditionValue) !void {
+    switch (condition) {
+        .append => try append(allocator, input, data),
+        .pop => pop(input),
+        .clear => clear(input),
+        .remove => try remove(allocator, input, data),
+        .removeat => try removeat(allocator, input, data),
+    }
+}
+
+fn pop(input: *zid.Data) void {
+    switch (input.*) {
+        .IntArray => |v| if (v.len > 4) {
+            input.*.IntArray = v[0 .. v.len - input.size()];
+        },
+        .FloatArray => |v| if (v.len > 4) {
+            input.*.FloatArray = v[0 .. v.len - input.size()];
+        },
+        .UnixArray => |v| if (v.len > 4) {
+            input.*.UnixArray = v[0 .. v.len - input.size()];
+        },
+        .UUIDArray => |v| if (v.len > 4) {
+            input.*.UUIDArray = v[0 .. v.len - input.size()];
+        },
+        .BoolArray => |v| if (v.len > 4) {
+            input.*.BoolArray = v[0 .. v.len - input.size()];
+        },
+        .StrArray => |v| if (v.len > 4) {
+            input.*.StrArray = v[0 .. v.len - input.size()];
+        },
+        else => unreachable,
+    }
+}
+
+fn clear(input: *zid.Data) void {
+    switch (input.*) {
+        .IntArray => input.*.IntArray = zid.allocEncodArray.Empty(),
+        .FloatArray => input.*.FloatArray = zid.allocEncodArray.Empty(),
+        .UnixArray => input.*.UnixArray = zid.allocEncodArray.Empty(),
+        .UUIDArray => input.*.UUIDArray = zid.allocEncodArray.Empty(),
+        .BoolArray => input.*.BoolArray = zid.allocEncodArray.Empty(),
+        .StrArray => input.*.StrArray = zid.allocEncodArray.Empty(),
+        else => unreachable,
+    }
+}
+
+fn allocForAppend(allocator: std.mem.Allocator, input: *zid.Data, data: []ConditionValue) []zid.Data {
+    switch (input.*) {
+        .UUIDArray => {
+            var total: usize = 0;
+            for (data) |d| total += d.link_array.count();
+            return try allocator.alloc(zid.Data, total);
+        },
+        else => return try allocator.alloc(zid.Data, data.len),
+    }
+}
+// I think I could use meta programming here by adding the type as argument
+fn append(allocator: std.mem.Allocator, input: *zid.Data, data: []ConditionValue) !void {
+    switch (input.*) {
+        .IntArray => {
+            // 1. Make a list of the right type from ConditionValue
+            var array = std.ArrayList(i32).init(allocator);
+            defer array.deinit();
+            for (data) |d| try array.append(d.int);
+
+            // 2. Encode the new array
+            const new_array = try zid.allocEncodArray.Int(allocator, array.items);
+
+            // 3. Add the new array at the end of the old one without the first 4 bytes that are the number of value in the array
+            var updated_array = std.ArrayList(u8).init(allocator);
+            try updated_array.appendSlice(input.IntArray);
+            try updated_array.appendSlice(new_array[4..]);
+
+            // 4. Update the number of value in the array
+            const new_len = input.size() + data.len;
+            @memcpy(updated_array.items[0..@sizeOf(u64)], std.mem.asBytes(&new_len));
+
+            // 5. Update the input
+            input.*.IntArray = try updated_array.toOwnedSlice();
+        },
+        .FloatArray => {
+            var array = std.ArrayList(f64).init(allocator);
+            defer array.deinit();
+            for (data) |d| try array.append(d.float);
+            const new_array = try zid.allocEncodArray.Float(allocator, array.items);
+            var updated_array = std.ArrayList(u8).init(allocator);
+            try updated_array.appendSlice(input.FloatArray);
+            try updated_array.appendSlice(new_array[4..]);
+            const new_len = input.size() + data.len;
+            @memcpy(updated_array.items[0..@sizeOf(u64)], std.mem.asBytes(&new_len));
+            input.*.FloatArray = try updated_array.toOwnedSlice();
+        },
+        .UnixArray => {
+            var array = std.ArrayList(u64).init(allocator);
+            defer array.deinit();
+            for (data) |d| try array.append(d.unix);
+            const new_array = try zid.allocEncodArray.Unix(allocator, array.items);
+            var updated_array = std.ArrayList(u8).init(allocator);
+            try updated_array.appendSlice(input.UnixArray);
+            try updated_array.appendSlice(new_array[4..]);
+            const new_len = input.size() + data.len;
+            @memcpy(updated_array.items[0..@sizeOf(u64)], std.mem.asBytes(&new_len));
+            input.*.UnixArray = try updated_array.toOwnedSlice();
+        },
+        .BoolArray => {
+            var array = std.ArrayList(bool).init(allocator);
+            defer array.deinit();
+            for (data) |d| try array.append(d.bool_);
+            const new_array = try zid.allocEncodArray.Bool(allocator, array.items);
+            var updated_array = std.ArrayList(u8).init(allocator);
+            try updated_array.appendSlice(input.BoolArray);
+            try updated_array.appendSlice(new_array[4..]);
+            const new_len = input.size() + data.len;
+            @memcpy(updated_array.items[0..@sizeOf(u64)], std.mem.asBytes(&new_len));
+            input.*.BoolArray = try updated_array.toOwnedSlice();
+        },
+        .StrArray => {
+            var array = std.ArrayList([]const u8).init(allocator);
+            defer array.deinit();
+            for (data) |d| try array.append(d.str);
+            const new_array = try zid.allocEncodArray.Str(allocator, array.items);
+            var updated_array = std.ArrayList(u8).init(allocator);
+            try updated_array.appendSlice(input.StrArray);
+            try updated_array.appendSlice(new_array[4..]);
+            const new_len = input.size() + data.len;
+            @memcpy(updated_array.items[0..@sizeOf(u64)], std.mem.asBytes(&new_len));
+            input.*.StrArray = try updated_array.toOwnedSlice();
+        },
+        .UUIDArray => { // If input is a UUID array, that mean all data are also UUIDArray. There should be only one UUIDArray in data as it is use like that "friends APPEND {name = 'Bob'}"
+            var array = std.ArrayList([16]u8).init(allocator);
+            defer array.deinit();
+            for (data) |d| {
+                var iter = d.link_array.keyIterator();
+                while (iter.next()) |uuid| try array.append(uuid.bytes);
+            }
+            const new_array = try zid.allocEncodArray.UUID(allocator, array.items);
+            var updated_array = std.ArrayList(u8).init(allocator);
+            try updated_array.appendSlice(input.UUIDArray);
+            try updated_array.appendSlice(new_array[4..]);
+            const new_len = input.size() + array.items.len;
+            @memcpy(updated_array.items[0..@sizeOf(u64)], std.mem.asBytes(&new_len));
+            input.*.UUIDArray = try updated_array.toOwnedSlice();
+        },
+        else => unreachable,
+    }
+}
+
+// TODO: Change the array for a map to speed up thing
+// And also I dont really need to realoc anything, only append need because here it can only go lower
+// So I could just memcopy the remaining of the bytes at the current position, so it overwrite the value to remove
+// Like if I want to re;ove 3 in [1 2 3 4 5], it would become [1 2 4 5 5]. Then I dont take the last value when I return.
+// But that mean I keep in memory useless data, so maybe not
+fn remove(allocator: std.mem.Allocator, input: *zid.Data, data: []ConditionValue) !void {
+    var iter = try zid.ArrayIterator.init(input.*);
+    switch (input.*) {
+        .IntArray => {
+            var array = std.ArrayList(i32).init(allocator);
+            defer array.deinit();
+            while (iter.next()) |v| if (!in(v, data)) try array.append(v.Int);
+            input.*.IntArray = try zid.allocEncodArray.Int(allocator, array.items);
+        },
+        .FloatArray => {
+            var array = std.ArrayList(f64).init(allocator);
+            defer array.deinit();
+            while (iter.next()) |v| if (!in(v, data)) try array.append(v.Float);
+            input.*.FloatArray = try zid.allocEncodArray.Float(allocator, array.items);
+        },
+        .UnixArray => {
+            var array = std.ArrayList(u64).init(allocator);
+            defer array.deinit();
+            while (iter.next()) |v| if (!in(v, data)) try array.append(v.Unix);
+            input.*.UnixArray = try zid.allocEncodArray.Unix(allocator, array.items);
+        },
+        .BoolArray => {
+            var array = std.ArrayList(bool).init(allocator);
+            defer array.deinit();
+            while (iter.next()) |v| if (!in(v, data)) try array.append(v.Bool);
+            input.*.BoolArray = try zid.allocEncodArray.Bool(allocator, array.items);
+        },
+        .StrArray => {
+            var array = std.ArrayList([]const u8).init(allocator);
+            defer array.deinit();
+            while (iter.next()) |v| if (!in(v, data)) try array.append(v.Str);
+            input.*.StrArray = try zid.allocEncodArray.Str(allocator, array.items);
+        },
+        .UUIDArray => {
+            var array = std.ArrayList([16]u8).init(allocator);
+            defer array.deinit();
+            while (iter.next()) |v| if (!in(v, data)) try array.append(v.UUID);
+            input.*.UUIDArray = try zid.allocEncodArray.UUID(allocator, array.items);
+        },
+        else => unreachable,
+    }
+}
+
+fn removeat(allocator: std.mem.Allocator, input: *zid.Data, data: []ConditionValue) !void {
+    var iter = try zid.ArrayIterator.init(input.*);
+    switch (input.*) {
+        .IntArray => {
+            var array = std.ArrayList(i32).init(allocator);
+            defer array.deinit();
+            var i: i32 = 0; // Maybe use usize because here it limite the size of the array
+            while (iter.next()) |v| {
+                defer i += 1;
+                if (!in(zid.Data{ .Int = i }, data)) try array.append(v.Int);
+            }
+            input.*.IntArray = try zid.allocEncodArray.Int(allocator, array.items);
+        },
+        .FloatArray => {
+            var array = std.ArrayList(f64).init(allocator);
+            defer array.deinit();
+            var i: i32 = 0; // Maybe use usize because here it limite the size of the array
+            while (iter.next()) |v| {
+                defer i += 1;
+                if (!in(zid.Data{ .Int = i }, data)) try array.append(v.Float);
+            }
+            input.*.FloatArray = try zid.allocEncodArray.Float(allocator, array.items);
+        },
+        .UnixArray => {
+            var array = std.ArrayList(u64).init(allocator);
+            defer array.deinit();
+            var i: i32 = 0; // Maybe use usize because here it limite the size of the array
+            while (iter.next()) |v| {
+                defer i += 1;
+                if (!in(zid.Data{ .Int = i }, data)) try array.append(v.Unix);
+            }
+            input.*.UnixArray = try zid.allocEncodArray.Unix(allocator, array.items);
+        },
+        .BoolArray => {
+            var array = std.ArrayList(bool).init(allocator);
+            defer array.deinit();
+            var i: i32 = 0; // Maybe use usize because here it limite the size of the array
+            while (iter.next()) |v| {
+                defer i += 1;
+                if (!in(zid.Data{ .Int = i }, data)) try array.append(v.Bool);
+            }
+            input.*.BoolArray = try zid.allocEncodArray.Bool(allocator, array.items);
+        },
+        .StrArray => {
+            var array = std.ArrayList([]const u8).init(allocator);
+            defer array.deinit();
+            var i: i32 = 0; // Maybe use usize because here it limite the size of the array
+            while (iter.next()) |v| {
+                defer i += 1;
+                if (!in(zid.Data{ .Int = i }, data)) try array.append(v.Str);
+            }
+            input.*.StrArray = try zid.allocEncodArray.Str(allocator, array.items);
+        },
+        .UUIDArray => unreachable, // I cant do that for removeat because link don't really have order
+        else => unreachable,
+    }
+}
+
+// Should just use a map.contain
+fn in(x: zid.Data, y: []ConditionValue) bool {
+    switch (x) {
+        .Int => |v| for (y) |z| if (v == z.int) return true,
+        .Float => |v| for (y) |z| if (v == z.float) return true,
+        .Unix => |v| for (y) |z| if (v == z.unix) return true,
+        .Bool => |v| for (y) |z| if (v == z.bool_) return true,
+        .Str => |v| for (y) |z| if (std.mem.eql(u8, z.str, v)) return true,
+        .UUID => |v| for (y) |z| if (z.link_array.contains(dtype.UUID{ .bytes = v })) return true,
+        else => unreachable,
+    }
+    return false;
+}
diff --git a/src/file/core.zig b/src/file/core.zig
index d399bc6..20d0e66 100644
--- a/src/file/core.zig
+++ b/src/file/core.zig
@@ -1,4 +1,5 @@
 const std = @import("std");
+const config = @import("config");
 const Pool = std.Thread.Pool;
 const SchemaEngine = @import("../schema/core.zig");
 
@@ -6,6 +7,7 @@ const ZipponError = @import("error").ZipponError;
 const log = std.log.scoped(.fileEngine);
 
 var path_to_ZipponDB_dir_buffer: [1024]u8 = undefined;
+pub var data_buffer: [config.BUFFER_SIZE]u8 = undefined;
 
 /// Manage everything that is relate to read or write in files
 /// Or even get stats, whatever. If it touch files, it's here
@@ -19,14 +21,25 @@ pub usingnamespace @import("read.zig");
 pub usingnamespace @import("write.zig");
 pub usingnamespace @import("dump.zig");
 
-allocator: std.mem.Allocator = std.heap.page_allocator,
+arena: *std.heap.ArenaAllocator,
+allocator: std.mem.Allocator,
 path_to_ZipponDB_dir: []const u8,
 thread_pool: *Pool, // same pool as the ThreadEngine
 schema_engine: SchemaEngine = undefined, // This is init after the FileEngine and I attach after. Do I need to init after tho ?
 
-pub fn init(path: []const u8, thread_pool: *Pool) ZipponError!Self {
+pub fn init(allocator: std.mem.Allocator, path: []const u8, thread_pool: *Pool) ZipponError!Self {
+    const arena = allocator.create(std.heap.ArenaAllocator) catch return ZipponError.MemoryError;
+    arena.* = std.heap.ArenaAllocator.init(allocator);
     return Self{
+        .arena = arena,
+        .allocator = arena.allocator(),
         .path_to_ZipponDB_dir = std.fmt.bufPrint(&path_to_ZipponDB_dir_buffer, "{s}", .{path}) catch return ZipponError.MemoryError,
         .thread_pool = thread_pool,
     };
 }
+
+pub fn deinit(self: *Self) void {
+    const parent_allocator = self.arena.child_allocator;
+    self.arena.deinit();
+    parent_allocator.destroy(self.arena);
+}
diff --git a/src/file/read.zig b/src/file/read.zig
index 803993b..db60fb5 100644
--- a/src/file/read.zig
+++ b/src/file/read.zig
@@ -28,13 +28,9 @@ var path_buffer: [1024]u8 = undefined;
 /// Use a struct name to populate a list with all UUID of this struct
 /// TODO: Multi thread that too
 pub fn getNumberOfEntityAndFile(self: *Self, struct_name: []const u8) ZipponError!struct { entity: usize, file: usize } {
-    var arena = std.heap.ArenaAllocator.init(self.allocator);
-    defer arena.deinit();
-    const allocator = arena.allocator();
-
     const sstruct = try self.schema_engine.structName2SchemaStruct(struct_name);
-    const to_parse = try self.allFileIndex(allocator, struct_name);
-    defer allocator.free(to_parse);
+    const to_parse = try self.allFileIndex(self.allocator, struct_name);
+    defer self.allocator.free(to_parse);
 
     return .{ .entity = sstruct.uuid_file_index.map.count(), .file = to_parse.len };
 }
diff --git a/src/file/utils.zig b/src/file/utils.zig
index e0020f2..f5573a6 100644
--- a/src/file/utils.zig
+++ b/src/file/utils.zig
@@ -5,6 +5,7 @@ const Self = @import("core.zig").Self;
 const ZipponError = @import("error").ZipponError;
 const Allocator = std.mem.Allocator;
 const ConditionValue = @import("../dataStructure/filter.zig").ConditionValue;
+const ValueOrArray = @import("../ziql/parts/newData.zig").ValueOrArray;
 const dtype = @import("dtype");
 const UUID = dtype.UUID;
 const zid = @import("ZipponData");
@@ -115,7 +116,7 @@ pub fn orderedNewData(
     self: *Self,
     allocator: Allocator,
     struct_name: []const u8,
-    map: std.StringHashMap(ConditionValue),
+    map: std.StringHashMap(ValueOrArray),
 ) ZipponError![]zid.Data {
     const members = try self.schema_engine.structName2structMembers(struct_name);
     var datas = allocator.alloc(zid.Data, (members.len)) catch return ZipponError.MemoryError;
@@ -125,7 +126,7 @@ pub fn orderedNewData(
 
     for (members, 0..) |member, i| {
         if (i == 0) continue; // Skip the id
-        datas[i] = try string2Data(allocator, map.get(member).?);
+        datas[i] = try string2Data(allocator, map.get(member).?.value);
     }
 
     return datas;
diff --git a/src/file/write.zig b/src/file/write.zig
index 7df0aa1..a5e0b12 100644
--- a/src/file/write.zig
+++ b/src/file/write.zig
@@ -2,6 +2,7 @@ const std = @import("std");
 const config = @import("config");
 const utils = @import("../utils.zig");
 const zid = @import("ZipponData");
+const updateData = @import("array.zig").updateData;
 const Allocator = std.mem.Allocator;
 const Self = @import("core.zig").Self;
 const ZipponError = @import("error").ZipponError;
@@ -14,6 +15,7 @@ const RelationMap = @import("../dataStructure/relationMap.zig");
 const JsonString = RelationMap.JsonString;
 const EntityWriter = @import("entityWriter.zig");
 const ThreadSyncContext = @import("../thread/context.zig");
+const ValueOrArray = @import("../ziql/parts/newData.zig").ValueOrArray;
 
 const dtype = @import("dtype");
 const s2t = dtype.s2t;
@@ -27,10 +29,10 @@ var path_buffer: [1024]u8 = undefined;
 pub fn addEntity(
     self: *Self,
     struct_name: []const u8,
-    maps: []std.StringHashMap(ConditionValue),
+    maps: []std.StringHashMap(ValueOrArray),
     writer: anytype,
 ) ZipponError!void {
-    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    var arena = std.heap.ArenaAllocator.init(self.allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
 
@@ -62,15 +64,17 @@ pub fn addEntity(
     data_writer.flush() catch return ZipponError.ZipponDataError;
 }
 
+const UpdatePosibility = enum { fix, vari, stay };
+
 pub fn updateEntities(
     self: *Self,
     struct_name: []const u8,
     filter: ?Filter,
-    map: std.StringHashMap(ConditionValue),
+    map: std.StringHashMap(ValueOrArray),
     writer: anytype,
     additional_data: *AdditionalData,
 ) ZipponError!void {
-    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    var arena = std.heap.ArenaAllocator.init(self.allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
 
@@ -91,21 +95,32 @@ pub fn updateEntities(
         list.* = std.ArrayList(u8).init(allocator);
     }
 
-    var new_data_buff = allocator.alloc(zid.Data, sstruct.members.len) catch return ZipponError.MemoryError;
+    var index_switch = std.ArrayList(UpdatePosibility).init(allocator);
+    defer index_switch.deinit();
 
-    // Convert the map to an array of ZipponData Data type, to be use with ZipponData writter
-    for (sstruct.members, 0..) |member, i| {
-        if (!map.contains(member)) continue;
-        new_data_buff[i] = try @import("utils.zig").string2Data(allocator, map.get(member).?);
+    // If the member name is not in the map, it stay
+    // Otherwise it need to be update. For that 2 scenarios:
+    // - Update all entities with a const .fix
+    // - Update entities base on themself .vari
+    // FIXME: I'm not sure that id is in the array, need to check, also need to check to prevent updating it
+    for (sstruct.members) |member| {
+        if (map.get(member)) |voa| {
+            switch (voa) {
+                .value => index_switch.append(.fix) catch return ZipponError.MemoryError,
+                .array => index_switch.append(.vari) catch return ZipponError.MemoryError,
+            }
+        } else {
+            index_switch.append(.stay) catch return ZipponError.MemoryError;
+        }
     }
 
     // Spawn threads for each file
     for (to_parse, 0..) |file_index, i| {
         self.thread_pool.spawn(updateEntitiesOneFile, .{
-            new_data_buff,
             sstruct,
             filter,
-            &map,
+            map,
+            index_switch.items,
             thread_writer_list[i].writer(),
             file_index,
             dir,
@@ -125,10 +140,10 @@ pub fn updateEntities(
 }
 
 fn updateEntitiesOneFile(
-    new_data_buff: []zid.Data,
     sstruct: SchemaStruct,
     filter: ?Filter,
-    map: *const std.StringHashMap(ConditionValue),
+    map: std.StringHashMap(ValueOrArray),
+    index_switch: []UpdatePosibility,
     writer: anytype,
     file_index: u64,
     dir: std.fs.Dir,
@@ -140,6 +155,20 @@ fn updateEntitiesOneFile(
     defer fa.reset();
     const allocator = fa.allocator();
 
+    var new_data_buff = allocator.alloc(zid.Data, index_switch.len) catch |err| {
+        sync_context.logError("Cant init new data buff", err);
+        return;
+    };
+
+    // First I fill the one that are updated by a const
+    for (index_switch, 0..) |is, i| switch (is) {
+        .fix => new_data_buff[i] = @import("utils.zig").string2Data(allocator, map.get(sstruct.members[i]).?.value) catch |err| {
+            sync_context.logError("Writting data", err);
+            return;
+        },
+        else => {},
+    };
+
     const path = std.fmt.bufPrint(&path_buffer, "{d}.zid", .{file_index}) catch |err| {
         sync_context.logError("Error creating file path", err);
         return;
@@ -176,11 +205,18 @@ fn updateEntitiesOneFile(
     }) |row| {
         if (!finish_writing and (filter == null or filter.?.evaluate(row))) {
             // Add the unchanged Data in the new_data_buff
-            new_data_buff[0] = row[0];
-            for (sstruct.members, 0..) |member, i| {
-                if (map.contains(member)) continue;
-                new_data_buff[i] = row[i];
-            }
+            for (index_switch, 0..) |is, i| switch (is) {
+                .stay => new_data_buff[i] = row[i],
+                .vari => {
+                    const x = map.get(sstruct.members[i]).?.array;
+                    updateData(allocator, x.condition, &row[i], x.data) catch |err| {
+                        sync_context.logError("Error updating data", err);
+                        zid.deleteFile(new_path, dir) catch {};
+                        return;
+                    };
+                },
+                else => {},
+            };
 
             log.debug("{d} {any}\n\n", .{ new_data_buff.len, new_data_buff });
 
@@ -233,7 +269,7 @@ pub fn deleteEntities(
     writer: anytype,
     additional_data: *AdditionalData,
 ) ZipponError!void {
-    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    var arena = std.heap.ArenaAllocator.init(self.allocator);
     defer arena.deinit();
     const allocator = arena.allocator();
 
diff --git a/src/main.zig b/src/main.zig
index 8241941..98ded3f 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -48,7 +48,10 @@ pub fn setLogPath(path: []const u8) void {
 }
 
 pub fn main() !void {
-    var cli = Cli.init(null, null);
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+
+    var cli = Cli.init(arena.allocator(), null, null);
     defer cli.deinit();
 
     try cli.start();
diff --git a/src/schema/core.zig b/src/schema/core.zig
index 465e61c..b389294 100644
--- a/src/schema/core.zig
+++ b/src/schema/core.zig
@@ -13,18 +13,19 @@ const log = std.log.scoped(.schemaEngine);
 /// This include keeping in memory the schema and schema file, and some functions to get like all members of a specific struct.
 pub const Self = @This();
 
-var arena: std.heap.ArenaAllocator = undefined;
-pub var allocator: Allocator = undefined;
 var schema_buffer: [config.BUFFER_SIZE]u8 = undefined;
 
 pub usingnamespace @import("utils.zig");
 
+arena: *std.heap.ArenaAllocator,
+allocator: Allocator,
 struct_array: []SchemaStruct,
 null_terminated: [:0]u8,
 
-pub fn init(path: []const u8, file_engine: *FileEngine) ZipponError!Self {
-    arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
-    allocator = arena.allocator();
+pub fn init(parent_allocator: Allocator, path: []const u8, file_engine: *FileEngine) ZipponError!Self {
+    const arena = parent_allocator.create(std.heap.ArenaAllocator) catch return ZipponError.MemoryError;
+    arena.* = std.heap.ArenaAllocator.init(parent_allocator);
+    const allocator = arena.allocator();
 
     var buffer: [config.BUFFER_SIZE]u8 = undefined;
 
@@ -48,15 +49,15 @@ pub fn init(path: []const u8, file_engine: *FileEngine) ZipponError!Self {
     }
 
     return Self{
+        .arena = arena,
+        .allocator = allocator,
         .struct_array = struct_array.toOwnedSlice() catch return ZipponError.MemoryError,
         .null_terminated = null_terminated,
     };
 }
 
-pub fn deinit(_: Self) void {
-    arena.deinit();
-}
-
-pub fn getAllocator() Allocator {
-    return allocator;
+pub fn deinit(self: *Self) void {
+    const parent_allocator = self.arena.child_allocator;
+    self.arena.deinit();
+    parent_allocator.destroy(self.arena);
 }
diff --git a/src/schema/utils.zig b/src/schema/utils.zig
index 89b70b0..63c5aa6 100644
--- a/src/schema/utils.zig
+++ b/src/schema/utils.zig
@@ -8,6 +8,7 @@ const SchemaStruct = @import("struct.zig");
 const ConditionValue = @import("../dataStructure/filter.zig").ConditionValue;
 const AdditionalData = @import("../dataStructure/additionalData.zig");
 const RelationMap = @import("../dataStructure/relationMap.zig");
+const ValueOrArray = @import("../ziql/parts/newData.zig").ValueOrArray;
 const JsonString = RelationMap.JsonString;
 
 const ZipponError = @import("error").ZipponError;
@@ -100,7 +101,7 @@ pub fn linkedStructName(self: Self, struct_name: []const u8, member_name: []cons
 pub fn checkIfAllMemberInMap(
     self: Self,
     struct_name: []const u8,
-    map: *std.StringHashMap(ConditionValue),
+    map: *std.StringHashMap(ValueOrArray),
     error_message_buffer: *std.ArrayList(u8),
 ) ZipponError!bool {
     const all_struct_member = try self.structName2structMembers(struct_name);
diff --git a/src/thread/engine.zig b/src/thread/engine.zig
index 33da7e4..5ed8cfe 100644
--- a/src/thread/engine.zig
+++ b/src/thread/engine.zig
@@ -6,32 +6,32 @@ const ZipponError = @import("error").ZipponError;
 const CPU_CORE = @import("config").CPU_CORE;
 const log = std.log.scoped(.thread);
 
-const allocator = std.heap.page_allocator;
-
-var thread_arena: std.heap.ThreadSafeAllocator = undefined;
-var thread_pool: Pool = undefined;
-
 pub const ThreadEngine = @This();
 
 thread_arena: *std.heap.ThreadSafeAllocator,
 thread_pool: *Pool,
 
-pub fn init() ThreadEngine {
-    thread_arena = std.heap.ThreadSafeAllocator{
+pub fn init(allocator: std.mem.Allocator) !ThreadEngine {
+    const thread_arena = try allocator.create(std.heap.ThreadSafeAllocator);
+    thread_arena.* = std.heap.ThreadSafeAllocator{
         .child_allocator = allocator,
     };
 
+    const thread_pool = try allocator.create(std.Thread.Pool);
     thread_pool.init(std.Thread.Pool.Options{
         .allocator = thread_arena.allocator(),
         .n_jobs = CPU_CORE,
     }) catch @panic("=(");
 
     return ThreadEngine{
-        .thread_pool = &thread_pool,
-        .thread_arena = &thread_arena,
+        .thread_pool = thread_pool,
+        .thread_arena = thread_arena,
     };
 }
 
-pub fn deinit(_: ThreadEngine) void {
-    thread_pool.deinit();
+pub fn deinit(self: *ThreadEngine) void {
+    const parent_allocator = self.thread_arena.allocator();
+    self.thread_pool.deinit();
+    parent_allocator.destroy(self.thread_arena);
+    parent_allocator.destroy(self.thread_pool);
 }
diff --git a/src/ziql/parser.zig b/src/ziql/parser.zig
index 65d1481..2b78ab9 100644
--- a/src/ziql/parser.zig
+++ b/src/ziql/parser.zig
@@ -7,13 +7,8 @@ const Tokenizer = @import("tokenizer.zig").Tokenizer;
 const dtype = @import("dtype");
 const UUID = dtype.UUID;
 
-const Filter = @import("../dataStructure/filter.zig").Filter;
-const Condition = @import("../dataStructure/filter.zig").Condition;
-const ConditionValue = @import("../dataStructure/filter.zig").ConditionValue;
-const ComparisonOperator = @import("../dataStructure/filter.zig").ComparisonOperator;
-
+const ValueOrArray = @import("parts/newData.zig").ValueOrArray;
 const AdditionalData = @import("../dataStructure/additionalData.zig").AdditionalData;
-const AdditionalDataMember = @import("../dataStructure/additionalData.zig").AdditionalDataMember;
 const send = @import("../utils.zig").send;
 const printError = @import("../utils.zig").printError;
 
@@ -74,8 +69,6 @@ pub usingnamespace @import("parts/filter.zig");
 pub usingnamespace @import("parts/additionalData.zig");
 pub usingnamespace @import("utils.zig");
 
-var toker: Tokenizer = undefined;
-
 toker: *Tokenizer = undefined,
 file_engine: *FileEngine,
 schema_engine: *SchemaEngine,
@@ -94,7 +87,7 @@ pub fn parse(self: *Self, buffer: [:0]const u8) ZipponError!void {
 
     try @import("parts/value.zig").initZeroMap();
 
-    toker = Tokenizer.init(buffer);
+    var toker = Tokenizer.init(buffer);
     self.toker = &toker;
 
     var state: State = .start;
@@ -241,9 +234,9 @@ pub fn parse(self: *Self, buffer: [:0]const u8) ZipponError!void {
                 defer members.deinit();
                 members.appendSlice(sstruct.members[1..]) catch return ZipponError.MemoryError;
 
-                var data_map = std.StringHashMap(ConditionValue).init(allocator);
+                var data_map = std.StringHashMap(ValueOrArray).init(allocator);
                 defer data_map.deinit();
-                try self.parseNewData(allocator, &data_map, struct_name, &members);
+                try self.parseNewData(allocator, &data_map, struct_name, &members, true);
 
                 var buff = std.ArrayList(u8).init(allocator);
                 defer buff.deinit();
@@ -267,9 +260,9 @@ pub fn parse(self: *Self, buffer: [:0]const u8) ZipponError!void {
                 defer members.deinit();
                 members.appendSlice(sstruct.members[1..]) catch return ZipponError.MemoryError;
 
-                var data_map = std.StringHashMap(ConditionValue).init(allocator);
+                var data_map = std.StringHashMap(ValueOrArray).init(allocator);
                 defer data_map.deinit();
-                try self.parseNewData(allocator, &data_map, struct_name, &members);
+                try self.parseNewData(allocator, &data_map, struct_name, &members, true);
 
                 var buff = std.ArrayList(u8).init(allocator);
                 defer buff.deinit();
@@ -340,19 +333,19 @@ pub fn parse(self: *Self, buffer: [:0]const u8) ZipponError!void {
             defer buff.deinit();
             buff.writer().writeAll("[") catch return ZipponError.WriteError;
 
-            var maps = std.ArrayList(std.StringHashMap(ConditionValue)).init(allocator);
+            var maps = std.ArrayList(std.StringHashMap(ValueOrArray)).init(allocator);
             defer maps.deinit();
 
             var local_arena = std.heap.ArenaAllocator.init(allocator);
             defer local_arena.deinit();
             const local_allocator = arena.allocator();
 
-            var data_map = std.StringHashMap(ConditionValue).init(allocator);
+            var data_map = std.StringHashMap(ValueOrArray).init(allocator);
             defer data_map.deinit();
 
             while (true) { // I could multithread that as it do take a long time for big benchmark
                 data_map.clearRetainingCapacity();
-                try self.parseNewData(local_allocator, &data_map, struct_name, &order);
+                try self.parseNewData(local_allocator, &data_map, struct_name, &order, false);
 
                 var error_message_buffer = std.ArrayList(u8).init(local_allocator);
                 defer error_message_buffer.deinit();
diff --git a/src/ziql/parts/newData.zig b/src/ziql/parts/newData.zig
index 25b98f3..2132e1f 100644
--- a/src/ziql/parts/newData.zig
+++ b/src/ziql/parts/newData.zig
@@ -8,15 +8,34 @@ const ZipponError = @import("error").ZipponError;
 
 const Self = @import("../parser.zig");
 
+// Ok so now for array how do I do. Because the map will not work anymore.
+// I guess I change the map member_name -> ConditionValue. The ConditionValue can become an enum, either COnditionValue either a new struct
+// The new struct need to have the operation (append, clear, etc) and a piece of data. The data can either be a single ConditionValue or an array of it.
+// Or maybe just an array, it can be an array of 1 value.
+// Like that I just need do add some switch on the enum to make it work
+
+pub const ValueOrArray = union(enum) {
+    value: ConditionValue,
+    array: ArrayUpdate,
+};
+
+pub const ArrayCondition = enum { append, clear, pop, remove, removeat };
+
+pub const ArrayUpdate = struct {
+    condition: ArrayCondition,
+    data: []ConditionValue,
+};
+
 /// Take the tokenizer and return a map of the ADD action.
 /// Keys are the member name and value are the string of the value in the query. E.g. 'Adrien' or '10'
 /// Entry token need to be (
 pub fn parseNewData(
     self: Self,
     allocator: Allocator,
-    map: *std.StringHashMap(ConditionValue),
+    map: *std.StringHashMap(ValueOrArray),
     struct_name: []const u8,
     order: *std.ArrayList([]const u8),
+    for_update: bool,
 ) !void {
     var token = self.toker.next();
     var keep_next = false;
@@ -80,8 +99,43 @@ pub fn parseNewData(
         .expect_equal => switch (token.tag) {
             // TODO: Implement stuff to manipulate array like APPEND or REMOVE
             .equal => state = .expect_new_value,
+            .keyword_pop => if (for_update) {} else return printError(
+                "Error: Can only manipulate array with UPDATE.",
+                ZipponError.SynthaxError,
+                self.toker.buffer,
+                token.loc.start,
+                token.loc.end,
+            ),
+            .keyword_clear => if (for_update) {} else return printError(
+                "Error: Can only manipulate array with UPDATE.",
+                ZipponError.SynthaxError,
+                self.toker.buffer,
+                token.loc.start,
+                token.loc.end,
+            ),
+            .keyword_append => if (for_update) {} else return printError(
+                "Error: Can only manipulate array with UPDATE.",
+                ZipponError.SynthaxError,
+                self.toker.buffer,
+                token.loc.start,
+                token.loc.end,
+            ),
+            .keyword_remove => if (for_update) {} else return printError(
+                "Error: Can only manipulate array with UPDATE.",
+                ZipponError.SynthaxError,
+                self.toker.buffer,
+                token.loc.start,
+                token.loc.end,
+            ),
+            .keyword_remove_at => if (for_update) {} else return printError(
+                "Error: Can only manipulate array with UPDATE.",
+                ZipponError.SynthaxError,
+                self.toker.buffer,
+                token.loc.start,
+                token.loc.end,
+            ),
             else => return printError(
-                "Error: Expected =",
+                "Error: Expected = or array manipulation keyword (APPEND, CLEAR, POP, REMOVE, REMOVEAT)",
                 ZipponError.SynthaxError,
                 self.toker.buffer,
                 token.loc.start,
@@ -91,7 +145,10 @@ pub fn parseNewData(
 
         .expect_new_value => {
             const data_type = self.schema_engine.memberName2DataType(struct_name, member_name) catch return ZipponError.StructNotFound;
-            map.put(member_name, try self.parseConditionValue(allocator, struct_name, member_name, data_type, &token)) catch return ZipponError.MemoryError;
+            map.put(
+                member_name,
+                ValueOrArray{ .value = try self.parseConditionValue(allocator, struct_name, member_name, data_type, &token) },
+            ) catch return ZipponError.MemoryError;
             if (data_type == .link or data_type == .link_array) {
                 token = self.toker.last_token;
                 keep_next = true;
diff --git a/test_runner.zig b/test_runner.zig
index ee5cfee..e87e324 100644
--- a/test_runner.zig
+++ b/test_runner.zig
@@ -5,10 +5,6 @@ const Allocator = std.mem.Allocator;
 
 const BORDER = "=" ** 80;
 
-const log_allocator = std.heap.page_allocator;
-var log_buff: [1024]u8 = undefined;
-var log_path: []const u8 = undefined;
-
 const log = std.log.scoped(.cli);
 pub const std_options = .{
     .logFn = myLog,