add joinTree evaluation for pre-agg

Author: KSDaemon

packages/cubejs-schema-compiler/src/adapter/PreAggregations.ts

@@ -4,7 +4,8 @@ import { CubeSymbols } from '../compiler/CubeSymbols';
 import { UserError } from '../compiler/UserError';
 import { BaseQuery } from './BaseQuery';
 import {
-  PreAggregationDefinition, PreAggregationDefinitions,
+  PreAggregationDefinition,
+  PreAggregationDefinitions,
   PreAggregationReferences,
   PreAggregationTimeDimensionReference
 } from '../compiler/CubeEvaluator';
@@ -1297,6 +1298,7 @@ export class PreAggregations {
         const preAggQuery = this.query.preAggregationQueryForSqlEvaluation(cube, aggregation, { inPreAggEvaluation: true });
         const aggregateMeasures = preAggQuery?.fullKeyQueryAggregateMeasures({ hasMultipliedForPreAggregation: true });
         references.multipliedMeasures = aggregateMeasures?.multipliedMeasures?.map(m => m.measure);
+        references.joinTree = preAggQuery?.join;
       }
       if (aggregation.type === 'rollupLambda') {
         if (references.rollups.length > 0) {

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

@@ -115,6 +115,25 @@ export type PreAggregationTimeDimensionReference = {
   granularity: string,
 };
 
+// TODO: Move to JonGraph when it will be ts
+export type JoinEdge = {
+  from: string;
+  to: string;
+  originalFrom: string;
+  originalTo: string;
+  join: {
+    relationship: string; // TODO Use an enum from validator
+    sql: Function,
+  }
+};
+
+// TODO: Move to JonGraph when it will be ts
+export type JoinTree = {
+  root: string;
+  joins: JoinEdge[];
+  multiplicationFactor: Record<string, boolean>;
+};
+
 /// Strings in `dimensions`, `measures` and `timeDimensions[*].dimension` can contain full join path, not just `cube.member`
 export type PreAggregationReferences = {
   allowNonStrictDateRangeMatch?: boolean,
@@ -123,6 +142,7 @@ export type PreAggregationReferences = {
   timeDimensions: Array<PreAggregationTimeDimensionReference>,
   rollups: Array<string>,
   multipliedMeasures?: Array<string>,
+  joinTree?: JoinTree;
 };
 
 export type PreAggregationInfo = {