liyuheng55555 commented on code in PR #9438:
URL: https://github.com/apache/iotdb/pull/9438#discussion_r1155516707
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server/src/main/java/org/apache/iotdb/db/mpp/plan/analyze/ExpressionTypeAnalyzer.java:
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@@ -296,6 +300,52 @@ public TSDataType visitNullOperand(NullOperand
nullOperand, Void context) {
return null;
}
+ @Override
+ public TSDataType visitCaseWhenThenExpression(
+ CaseWhenThenExpression caseWhenThenExpression, Void context) {
+ Set<TSDataType> typeSet = new HashSet<>();
+ for (WhenThenExpression whenThenExpression :
+ caseWhenThenExpression.getWhenThenExpressions()) {
+ typeSet.add(process(whenThenExpression, context));
+ }
+ TSDataType elseType =
process(caseWhenThenExpression.getElseExpression(), context);
+ if (elseType != null) {
+ typeSet.add(elseType);
+ }
+ // if TEXT exist, every branch need to be TEXT
+ if (typeSet.contains(TSDataType.TEXT)) {
+ if (typeSet.stream().anyMatch(tsDataType -> tsDataType !=
TSDataType.TEXT)) {
+ throw new SemanticException(
+ "CASE expression: TEXT and other types cannot exist at same
time");
Review Comment:
done.
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