klsince commented on a change in pull request #7332:
URL: https://github.com/apache/pinot/pull/7332#discussion_r692531210
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File path:
pinot-core/src/main/java/org/apache/pinot/core/operator/transform/function/CaseTransformFunction.java
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@@ -104,147 +104,62 @@ private TransformResultMetadata
calculateResultMetadata() {
Preconditions.checkState(thenStatementResultMetadata.isSingleValue(),
String.format("Unsupported multi-value expression in the THEN clause
of index: %d", i));
DataType thenStatementDataType =
thenStatementResultMetadata.getDataType();
+ if (thenStatementDataType == dataType) {
Review comment:
nit: perhaps add a comment for this method about how type is determined.
iiuc, it seems like we try to find the most common type for all `then clauses`
and `else clause` that can be cast to.
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