chucheng92 commented on code in PR #3320:
URL: https://github.com/apache/calcite/pull/3320#discussion_r1283139677
##########
core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
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@@ -4107,6 +4113,97 @@ public static List arrayExcept(List list1, List list2) {
return new ArrayList<>(result);
}
+ /** Support the ARRAY_INSERT(array, pos, val) function. */
+ public static @Nullable List arrayInsert(List baselist, Object pos, Object
val) {
+ if (baselist == null || pos == null) {
+ return null;
+ }
+ int posInt = (int) pos;
+ if (posInt == 0) {
+ throw new IllegalArgumentException("The index 0 is invalid. "
+ + "An index shall be either < 0 or > 0 (the first element has index
1)");
+ }
+
+ boolean usePositivePos = posInt > 0;
+
+ if (usePositivePos) {
+ int newArrayLength = Math.max(baselist.size() + 1, posInt);
Review Comment:
@NobiGo if position > arrayLength, it will insert null. pls see:
```
spark-sql (default)> SELECT array_insert(array(1, 2, 3, 4), -4, 5);
[5,1,2,3,4]
Time taken: 0.062 seconds, Fetched 1 row(s)
spark-sql (default)> SELECT array_insert(array(1, 2, 3, 4), -10, 5);
[5,null,null,null,null,null,null,1,2,3,4]
```
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