danny0405 commented on a change in pull request #1544: [CALCITE-3415] Supports
REGEXP_SUBSTR function
URL: https://github.com/apache/calcite/pull/1544#discussion_r341432643
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File path:
core/src/main/java/org/apache/calcite/sql/fun/SqlStdOperatorTable.java
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@@ -1762,6 +1762,8 @@ public SqlSyntax getSyntax() {
public static final SqlFunction NULLIF = new SqlNullifFunction();
+ public static final SqlFunction REGEXP_SUBSTR = new
SqlRegexpSubstrFunction();
+
Review comment:
You can add it to `SqlLibraryOperators` under the `MySql` and `Oracle` sql
dialects. SqlStdOperatorTable only accepts operator that belong to the SQL
standard now, as what its name implies.
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