libenchao commented on a change in pull request #12436:
URL: https://github.com/apache/flink/pull/12436#discussion_r433776897
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/codegen/calls/ScalarOperatorGens.scala
##########
@@ -1643,19 +1644,35 @@ object ScalarOperatorGens {
val resultTypeTerm = primitiveTypeTermForType(componentInfo)
val defaultTerm = primitiveDefaultValue(componentInfo)
+ if (index.literalValue.isDefined &&
+ index.literalValue.get.isInstanceOf[Int] &&
+ index.literalValue.get.asInstanceOf[Int] < 1) {
+ throw new ValidationException(s"Array element access needs an index
starting at 1 but was " +
+ s"${index.literalValue.get.asInstanceOf[Int]}.")
+ }
val idxStr = s"${index.resultTerm} - 1"
val arrayIsNull = s"${array.resultTerm}.isNullAt($idxStr)"
val arrayGet =
rowFieldReadAccess(ctx, idxStr, array.resultTerm, componentInfo)
+ /**
+ * Return null when array index out of bounds which follows Calcite's
behaviour.
+ * @see org.apache.calcite.sql.fun.SqlStdOperatorTable
+ */
val arrayAccessCode =
- s"""
- |${array.code}
- |${index.code}
- |boolean $nullTerm = ${array.nullTerm} || ${index.nullTerm} ||
$arrayIsNull;
- |$resultTypeTerm $resultTerm = $nullTerm ? $defaultTerm : $arrayGet;
- |""".stripMargin
-
+ s"""
+ |${array.code}
+ |${index.code}
+ |$resultTypeTerm $resultTerm;
+ |boolean $nullTerm;
+ |if (${idxStr} < 0 || ${idxStr} >= ${array.resultTerm}.size()) {
Review comment:
consider this case:
```sql
CREATE TABLE my_source (
idx int,
my_arr array<int>
) WITH (...);
SELECT my_arr[idx] FROM my_source;
```
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
