iwanttobepowerful commented on code in PR #4637:
URL: https://github.com/apache/calcite/pull/4637#discussion_r2596342100
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core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java:
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@@ -1184,6 +1190,147 @@ private static void shiftMapping(Map<Integer, Integer>
mapping, int startIndex,
return null;
}
+ /**
+ * Given the SQL:
+ * SELECT ename,
+ * (SELECT sum(c)
+ * FROM
+ * (SELECT deptno AS c
+ * FROM dept
+ * WHERE dept.deptno = emp.deptno
+ * UNION ALL
+ * SELECT 2 AS c
+ * FROM bonus
+ * WHERE bonus.job = emp.job) AS union_subquery
+ * ) AS correlated_sum
+ * FROM emp;
+ *
+ * <p>from:
+ * LogicalUnion(all=[true])
+ * LogicalProject(C=[CAST($0):INTEGER NOT NULL])
+ * LogicalFilter(condition=[=($0, $cor0.DEPTNO)])
+ * LogicalTableScan(table=[[scott, DEPT]])
+ * LogicalProject(C=[2])
+ * LogicalFilter(condition=[=($1, $cor0.JOB)])
+ * LogicalTableScan(table=[[scott, BONUS]])
+ *
+ * <p>to:
+ * LogicalUnion(all=[true])
+ * LogicalProject(JOB=[$0], DEPTNO=[$1], C=[$2])
+ * LogicalJoin(condition=[IS NOT DISTINCT FROM($1, $3)],
joinType=[inner])
+ * LogicalAggregate(group=[{2, 7}])
+ * LogicalTableScan(table=[[scott, EMP]])
+ * LogicalProject(C=[CAST($0):INTEGER NOT NULL], DEPTNO=[$0])
+ * LogicalTableScan(table=[[scott, DEPT]])
+ * LogicalProject(JOB=[$0], DEPTNO=[$1], C=[$2])
+ * LogicalJoin(condition=[IS NOT DISTINCT FROM($0, $3)],
joinType=[inner])
+ * LogicalAggregate(group=[{2, 7}])
+ * LogicalTableScan(table=[[scott, EMP]])
+ * LogicalProject(C=[2], JOB=[$1])
+ * LogicalFilter(condition=[IS NOT NULL($1)])
+ * LogicalTableScan(table=[[scott, BONUS]])
+ */
+ public @Nullable Frame decorrelateRel(SetOp rel, boolean isCorVarDefined,
+ boolean parentPropagatesNullValues) {
+ if (!isCorVarDefined) {
+ return decorrelateRelHelper(rel, false, parentPropagatesNullValues);
+ }
+
+ final Pair<CorrelationId, Frame> outerFramePair =
requireNonNull(this.frameStack.peek());
+ final CorrelationId outFrameCorrId = outerFramePair.left;
+ final Frame outFrame = outerFramePair.right;
+
+ // Collect CorDef from all inputs
+ ImmutableBitSet.Builder corFieldBuilder = ImmutableBitSet.builder();
+ List<Frame> frames = new ArrayList<>();
+ for (RelNode oldInput : rel.getInputs()) {
+ Frame frame = getInvoke(oldInput, true, rel, parentPropagatesNullValues);
+ if (frame == null) {
+ // If input has not been rewritten, do not rewrite this rel.
+ return null;
+ }
+ frames.add(frame);
+ for (Map.Entry<CorDef, Integer> corDefOutput :
frame.corDefOutputs.entrySet()) {
+ CorDef corDef = corDefOutput.getKey();
+ if (corDef.corr.equals(outFrameCorrId)) {
+ int newIdx =
requireNonNull(outFrame.oldToNewOutputs.get(corDef.field));
+ corFieldBuilder.set(newIdx);
+ }
+ }
+ }
+
+ ImmutableBitSet groupSet = corFieldBuilder.build();
+ List<RelNode> newInputs = new ArrayList<>();
+ final Map<Integer, Integer> mapOldToNewOutputs = new HashMap<>();
+ final NavigableMap<CorDef, Integer> corDefOutputs = new TreeMap<>();
Review Comment:
maybe not easy
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