xuzifu666 commented on code in PR #4431:
URL: https://github.com/apache/calcite/pull/4431#discussion_r2161569632
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core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java:
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@@ -1200,6 +1200,21 @@ static RelDataType deriveTypeSplit(SqlOperatorBinding
operatorBinding,
SqlFunctionCategory.STRING)
.withOperandTypeInference(InferTypes.RETURN_TYPE);
+ /** The "CONCAT(arg, ...)" function that concatenates arguments.
+ * For example, "CONCAT('a', 'bc', 'd')" returns "abcd",
+ * "CONCAT(x'61', 'a')" returns "0x6161".
+ *
+ * <p>It accepts at least 1 argument and returns null if any of
+ * the arguments is null, if arguments contain bytestring, would return
bytes string. */
Review Comment:
Make sense, done.
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