chucheng92 commented on code in PR #3459:
URL: https://github.com/apache/calcite/pull/3459#discussion_r1358157015
##########
core/src/main/java/org/apache/calcite/sql/type/OperandTypes.java:
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@@ -1221,6 +1225,53 @@ private static class MapFromEntriesOperandTypeChecker
}
}
+ /**
+ * Operand type-checking strategy for a MAP function, it allows empty map.
+ */
+ private static class MapFunctionOperandTypeChecker
+ extends SameOperandTypeChecker {
+
+ MapFunctionOperandTypeChecker() {
+ super(-1);
Review Comment:
The args of map are non-fixed, so we set to -1 here. then `operandCount`
can dynamically set according to the number of input args. I've added some
comments for better readability.
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