snuyanzin commented on code in PR #24704:
URL: https://github.com/apache/flink/pull/24704#discussion_r1609798055
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flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/functions/sql/SqlJsonQueryFunctionWrapper.java:
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@@ -30,23 +39,67 @@
* VARCHAR_FORCE_NULLABLE} return type inference.
*/
class SqlJsonQueryFunctionWrapper extends SqlJsonQueryFunction {
+ private final SqlReturnTypeInference returnTypeInference;
+
+ SqlJsonQueryFunctionWrapper() {
+ this.returnTypeInference =
+ ReturnTypes.cascade(
+ SqlJsonQueryFunctionWrapper::explicitTypeSpec,
+ SqlTypeTransforms.FORCE_NULLABLE)
+ .orElse(VARCHAR_FORCE_NULLABLE);
+ }
@Override
public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
- RelDataType returnType =
VARCHAR_FORCE_NULLABLE.inferReturnType(opBinding);
+ RelDataType returnType =
returnTypeInference.inferReturnType(opBinding);
if (returnType == null) {
throw new IllegalArgumentException(
"Cannot infer return type for "
+ opBinding.getOperator()
+ "; operand types: "
+ opBinding.collectOperandTypes());
- } else {
- return returnType;
}
+ return returnType;
}
@Override
public SqlReturnTypeInference getReturnTypeInference() {
- return VARCHAR_FORCE_NULLABLE;
+ return returnTypeInference;
+ }
+
+ @Override
+ public boolean checkOperandTypes(SqlCallBinding callBinding, boolean
throwOnFailure) {
+ if (!super.checkOperandTypes(callBinding, throwOnFailure)) {
+ return false;
+ }
+
+ if (callBinding.getOperandCount() >= 6) {
+ final RelDataType type = SqlTypeUtil.deriveType(callBinding,
callBinding.operand(5));
+ if (SqlTypeUtil.isArray(type) &&
!SqlTypeUtil.isCharacter(type.getComponentType())) {
+ if (throwOnFailure) {
+ throw new ValidationException(
+ String.format(
+ "Unsupported array element type '%s' for
RETURNING ARRAY in JSON_QUERY().",
Review Comment:
One nice to have comment: not sure how easy to fix it
It looks like here the output of component type is different from Flink SQL
syntax
for instance for this query
```sql
SELECT JSON_QUERY('{"a":[{"c":"c1"},{"c":"c2"}]}', 'lax $.a[*].c' RETURNING
ARRAY<MAP<INTEGER, STRING>>);
```
I would expect something like
> Unsupported array element type 'MAP<INTEGER, STRING>' for RETURNING ARRAY
in JSON_QUERY().
however the actual message
is
>Unsupported array element type '(INTEGER, VARCHAR(2147483647)) MAP' for
RETURNING ARRAY in JSON_QUERY().
anyway, i think it only nice to have
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