cjj2010 commented on code in PR #4818:
URL: https://github.com/apache/calcite/pull/4818#discussion_r2929297104
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core/src/main/java/org/apache/calcite/util/RelToSqlConverterUtil.java:
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@@ -463,4 +445,22 @@ public ClickHouseSqlArrayTypeNameSpec(SqlTypeNameSpec
elementTypeName,
writer.endList(frame);
}
}
+
+ /**
+ * Unparses REGEXP function calls by converting from function call format
+ * (e.g., REGEXP(column, pattern)) to infix operator format (e.g., column
REGEXP pattern).
+ */
+ public static void unparseRegexp(SqlWriter writer, SqlCall call, int
leftPrec, int rightPrec) {
+ if (call.operandCount() != 2) {
+ throw new IllegalArgumentException("REGEXP operator requires exactly 2
operands");
Review Comment:
> This line of code was not covered by tests.
I tried to execute REGEXP ("brandname"), which checks for errors during the
SQL parsing validation phase and does not enter the dialect parsing phase. I
think I need to remove the judgment logic in the code
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