caicancai commented on code in PR #4071:
URL: https://github.com/apache/calcite/pull/4071#discussion_r1864813931
##########
core/src/main/java/org/apache/calcite/sql/type/ReturnTypes.java:
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@@ -603,13 +603,21 @@ public static SqlCall stripSeparator(SqlCall call) {
}
/**
- * Type-inference strategy for NVL2 function. It returns the least
restrictive type
- * between the second and third operands.
- */
- public static final SqlReturnTypeInference NVL2_RESTRICTIVE = opBinding ->
- opBinding.getTypeFactory().leastRestrictive(
- Arrays.asList(opBinding.getOperandType(1),
- opBinding.getOperandType(2)));
+ * Type-inference strategy for NVL2 function.
+ * If the first operand is nullable,
+ * it returns the least restrictive type between the second and third
operands.
+ * If the first operand is non-nullable,
+ * it return the second operand type.
+ */
+ public static final SqlReturnTypeInference NVL2_RESTRICTIVE = opBinding -> {
Review Comment:
@NobiGo I think this issue has been discussed in jira
https://issues.apache.org/jira/browse/CALCITE-6397
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