libenchao commented on code in PR #2929:
URL: https://github.com/apache/calcite/pull/2929#discussion_r1020832236
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core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java:
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@@ -1790,10 +1790,11 @@ private RexNode createCaseExpression(
@Override public RexNode visitLiteral(RexLiteral literal) {
// Use nullIndicator to decide whether to project null.
- // Do nothing if the literal is null.
+ // Do nothing if the literal is null or symbol.
if (!RexUtil.isNull(literal)
Review Comment:
We are using `LEFT` join type for scalar sub-query decorrelating, see here:
https://github.com/apache/calcite/blob/7277e53adea98e7dd8477d5a47e728aca6d8f680/core/src/main/java/org/apache/calcite/rel/rules/SubQueryRemoveRule.java#L136.
Hence, in this place, we'll wrap all expressions into case expression.
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