suibianwanwank commented on code in PR #4439:
URL: https://github.com/apache/calcite/pull/4439#discussion_r2166491219
##########
core/src/main/java/org/apache/calcite/sql/validate/implicit/AbstractTypeCoercion.java:
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@@ -213,7 +214,11 @@ protected boolean coerceColumnType(
}
RelDataType targetType3 = syncAttributes(validator.deriveType(scope,
node), targetType);
SqlNode node3 = castTo(node, targetType3);
- if (node.getKind() == SqlKind.IDENTIFIER) {
+ // Although this function is called coerceColumnType, it is not always
invoked on a "column".
Review Comment:
Will this affect the alias in scalar subqueries?
```
SELECT a, (select b from B where A.b=B.b) FROM A;
```
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