xuzifu666 commented on code in PR #5340:
URL: https://github.com/apache/calcite/pull/5340#discussion_r4325447581
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core/src/main/java/org/apache/calcite/sql/SqlUtil.java:
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@@ -766,6 +767,30 @@ private static Iterator<SqlOperator>
filterRoutinesByParameterTypeAndName(
});
}
+ /** Looks up a parameter name in a list of formal parameter names,
+ * case-insensitively.
+ *
+ * <p>Argument names from the parser are subject to unquoted casing (for
+ * example, {@code x => 1} becomes {@code X => 1}), while formal parameter
+ * names declared via {@link org.apache.calcite.linq4j.function.Parameter}
+ * annotations or reflection retain their case. Parameter names must
+ * therefore always be matched case-insensitively, consistent with
+ * {@link SqlCallBinding#operands()}.
+ *
+ * @param paramNames list of formal parameter names
+ * @param argName argument name to look up
+ * @return index of the first matching parameter, or -1 if not found
+ */
+ public static int lookupParamName(List<String> paramNames, String argName) {
Review Comment:
Done, renamed to lookupParamNameCaseInsensitive.
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