hanyuzheng7 commented on code in PR #22834:
URL: https://github.com/apache/flink/pull/22834#discussion_r1243949129
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flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/internal/BaseExpressions.java:
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@@ -1398,6 +1399,26 @@ public OutType arrayReverse() {
return toApiSpecificExpression(unresolvedCall(ARRAY_REVERSE,
toExpr()));
}
+ /**
+ * Returns an array that is a subset of the original array, extracted
based on the specified
+ * `start` index and `length`.
+ *
+ * <p>Supports both positive and negative indices. Positive indices start
from 1 (the first
+ * element) while negative indices start from the end of the array (-1
being the last element).
+ * If the original array or start or length are null, null is returned. If
the `length` exceeds
+ * the available elements starting from the `start` index, all elements
till the end of the
+ * array are returned. If abs(start) is greater than the length of the
array or start equal to 0
+ * or length is smaller than 0 or equal to 0, return null.
Review Comment:
Ok, let me change behavior of the function, and then change the description.
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