danny0405 commented on a change in pull request #1701: [CALCITE-3580] Oracle
EXTRACT(XML) Function Support
URL: https://github.com/apache/calcite/pull/1701#discussion_r361884894
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File path: core/src/main/java/org/apache/calcite/sql/type/OperandTypes.java
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@@ -231,6 +231,11 @@ public Consistency getConsistency() {
public static final FamilyOperandTypeChecker STRING_STRING_STRING =
family(SqlTypeFamily.STRING, SqlTypeFamily.STRING, SqlTypeFamily.STRING);
+ public static final SqlSingleOperandTypeChecker
STRING_STRING_OPTIONAL_STRING =
+ family(ImmutableList.of(SqlTypeFamily.STRING, SqlTypeFamily.STRING,
SqlTypeFamily.STRING),
Review comment:
The type should be `FamilyOperandTypeChecker`.
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