julianhyde commented on a change in pull request #1168: [CALCITE-3005]
Implement string functions: LEFT, RIGHT
URL: https://github.com/apache/calcite/pull/1168#discussion_r276577645
##########
File path:
core/src/main/java/org/apache/calcite/sql/fun/SqlStdOperatorTable.java
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@@ -1508,6 +1508,24 @@ public SqlOperandCountRange getOperandCountRange() {
OperandTypes.CHARACTER,
SqlFunctionCategory.STRING);
+ public static final SqlFunction LEFT =
+ new SqlFunction(
+ "LEFT",
+ SqlKind.OTHER_FUNCTION,
+ ReturnTypes.VARCHAR_2000,
Review comment:
The type inference should be the same as SUBSTRING. It can return null if
and only if at least one argument is null.
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