JiajunBernoulli commented on a change in pull request #2724:
URL: https://github.com/apache/calcite/pull/2724#discussion_r819519606
##########
File path:
core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java
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@@ -3301,6 +3301,71 @@ private void checkHavingAliasSameAsColumn(boolean
upperAlias) {
sql(query).ok(expected);
}
+
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-5013";>[CALCITE-5013]
+ * Unparse SqlSetOperator should be retained parentheses
+ * when the operand has limit or offset</a>. */
+ @Test void testSetOpRetainParentheses() {
Review comment:
Do you mean we should retain it when there is a `where` condition? Or we
always retain parentheses?
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