tmater commented on code in PR #4844:
URL: https://github.com/apache/calcite/pull/4844#discussion_r3199338846
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core/src/main/java/org/apache/calcite/sql/type/OperandTypes.java:
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@@ -554,6 +554,38 @@ public static SqlOperandTypeChecker variadic(
.or(OperandTypes.family(SqlTypeFamily.VARIANT))
.or(OperandTypes.family(SqlTypeFamily.ANY));
+ /**
+ * Operand type-checking strategy for the colon operator: first operand
+ * must be {@code VARIANT} (or {@code ANY}); the second operand is a
+ * path expression and is not type-checked.
+ */
+ public static final SqlOperandTypeChecker COLON =
Review Comment:
Yes, validation runs before `SqlToRelConverter`, so by the time the
convertlet could rewrite it to `ITEM`, the type check has already failed. The
`skill:type` failing case in `SqlValidatorTest.java:1546` exercises it directly.
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