wangshuo128 commented on a change in pull request #8513:
URL: https://github.com/apache/incubator-doris/pull/8513#discussion_r832987800
##########
File path: fe/fe-core/src/main/java/org/apache/doris/analysis/StmtRewriter.java
##########
@@ -310,10 +310,16 @@ private static SelectList
addMissingAggregationColumns(SelectList selectList,
private static void rewriteUnionStatement(SetOperationStmt stmt, Analyzer
analyzer)
throws AnalysisException {
for (SetOperationStmt.SetOperand operand: stmt.getOperands()) {
- Preconditions.checkState(operand.getQueryStmt() instanceof
SelectStmt);
- QueryStmt rewrittenQueryStmt = StmtRewriter.rewriteSelectStatement(
- (SelectStmt)operand.getQueryStmt(), operand.getAnalyzer());
- operand.setQueryStmt(rewrittenQueryStmt);
+ QueryStmt queryStmt = operand.getQueryStmt();
+ if (queryStmt instanceof SelectStmt) {
+ QueryStmt rewrittenQueryStmt =
rewriteSelectStatement((SelectStmt)queryStmt, operand.getAnalyzer());
+ operand.setQueryStmt(rewrittenQueryStmt);
+ } else if (queryStmt instanceof SetOperationStmt) {
+ rewriteUnionStatement((SetOperationStmt)queryStmt,
operand.getAnalyzer());
+ } else {
+ LOG.warn("Rewrite union statement failed. Because QueryStmt is
neither SelectStmt nor SetOperationStmt");
Review comment:
I meat to add a message in the exception description, thus users can ask
questions with the specific error message. WDYT?
```suggestion
throw new IllegalStateException("Rewrite union statement
failed. Because QueryStmt is neither SelectStmt nor SetOperationStmt");
```
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