feat(schema-compiler): Reduce memory usage after compilation is done

Author: KSDaemon

packages/cubejs-schema-compiler/src/compiler/CubeDictionary.js

@@ -13,4 +13,8 @@ export class CubeDictionary {
   resolveCube(cubeName) {
     return this.byId[cubeName];
   }
+
+  free() {
+    this.byId = {};
+  }
 }

packages/cubejs-schema-compiler/src/compiler/CubeSymbols.ts

@@ -214,6 +214,15 @@ export class CubeSymbols {
     this.evaluateViews = evaluateViews;
   }
 
+  public free() {
+    this.symbols = {};
+    this.builtCubes = {};
+    this.cubeDefinitions = {};
+    this.funcArgumentsValues = {};
+    this.cubeList = [];
+    this.resolveSymbolsCallContext = undefined;
+  }
+
   public compile(cubes: CubeDefinition[], errorReporter: ErrorReporter) {
     this.cubeDefinitions = Object.fromEntries(
       cubes.map((c): [string, CubeDefinition] => [c.name, c])

packages/cubejs-schema-compiler/src/compiler/DataSchemaCompiler.ts

@@ -335,6 +335,9 @@ export class DataSchemaCompiler {
         if (!this.omitErrors) {
           this.throwIfAnyErrors();
         }
+        // Free unneeded resources
+        this.cubeDictionary.free();
+        this.cubeSymbols.free();
         return res;
       });
     }