NobiGo commented on code in PR #3320:
URL: https://github.com/apache/calcite/pull/3320#discussion_r1285482457
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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:
I get it. Thanks for your explanation. How about we use the
`System.arraycopy()` and `Arrays.fill()` to implement this? Others are good to
me.
##########
site/_docs/reference.md:
##########
@@ -2658,6 +2658,7 @@ BigQuery's type system uses confusingly different names
for types and functions:
| s | ARRAY_CONTAINS(array, element) | Returns true if the
*array* contains the *element*
| s | ARRAY_DISTINCT(array) | Removes duplicate
values from the *array* that keeps ordering of elements
| s | ARRAY_EXCEPT(array1, array2) | Returns an array of the
elements in *array1* but not in *array2*, without duplicates
+| s | ARRAY_INSERT(array, pos, element) | Places *element* into
index *pos* of *array*. Array index start at 1, or start from the end if index
is negative. Index above array size appends the array, or prepends the array if
index is negative, with 'null' elements.
Review Comment:
`NULL` value is better?
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