DonnyZone commented on a change in pull request #1862: [CALCITE-3864] Add
Implementation for SqlLibraryOperators.CONCAT_FUNCTION in SqlFunctions and
correct the return type inference of SqlLibraryOperators.CONCAT_FUNCTION
URL: https://github.com/apache/calcite/pull/1862#discussion_r397748715
##########
File path: core/src/main/java/org/apache/calcite/sql/type/ReturnTypes.java
##########
@@ -655,6 +655,54 @@ public int size() {
return ret;
};
+
+ /**
+ * Type-inference strategy for String concatenation.
Review comment:
Improve the comment, you can refer to `DYADIC_STRING_SUM_PRECISION` for "||"
operator.
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