wutiangan commented on a change in pull request #3150: Support non-correlated
subquery in having clause
URL: https://github.com/apache/incubator-doris/pull/3150#discussion_r397250060
##########
File path: fe/src/main/java/org/apache/doris/analysis/SelectStmt.java
##########
@@ -839,19 +861,32 @@ private Expr rewriteCountDistinctForBitmapOrHLL(Expr
expr, Analyzer analyzer) {
private void analyzeAggregation(Analyzer analyzer) throws
AnalysisException {
// check having clause
if (havingClause != null) {
- if (havingClause.contains(Predicates.instanceOf(Subquery.class))) {
- throw new AnalysisException(
- "Subqueries are not supported in the HAVING clause.");
- }
Expr ambiguousAlias = getFirstAmbiguousAlias(havingClause);
if (ambiguousAlias != null) {
ErrorReport.reportAnalysisException(ErrorCode.ERR_NON_UNIQ_ERROR,
ambiguousAlias.toColumnLabel());
}
- // substitute aliases in place (ordinals not allowed in having
clause)
- havingPred = havingClause.substitute(aliasSMap, analyzer, false);
- havingPred.checkReturnsBool("HAVING clause", true);
+ /*
+ * The having clause need to be substitute by aliasSMap.
+ * And it is analyzed after substitute.
+ * For example:
+ * Query: select k1 a, sum(k2) b from table group by k1 having a >
1;
+ * Having clause: a > 1
+ * aliasSMap: <a, table.k1> <b, sum(table.k2)>
+ * After substitute: a > 1 changed to table.k1 > 1
+ * Analyzer: check column and other subquery in having clause
+ * having predicate: table.k1 > 1
+ */
+ /*
+ * TODO(ml): support substitute outer column in subquery
Review comment:
```suggestion
* TODO(ml): support substitute outer column in correlated
subquery
```
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