chucheng92 commented on code in PR #3320:
URL: https://github.com/apache/calcite/pull/3320#discussion_r1283201032
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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);
+
+ if (newArrayLength > MAX_ARRAY_LENGTH) {
+ throw new IndexOutOfBoundsException(
+ String.format(Locale.ROOT, "The new array length %s exceeds the
allowed limit.",
+ newArrayLength));
+ }
+
+ Object[] newArray = new Object[newArrayLength];
+
+ int posIndex = posInt - 1;
+ for (int i = 0; i < baselist.size(); i++) {
+ if (i >= posIndex) {
+ newArray[i + 1] = baselist.get(i);
+ } else {
+ newArray[i] = baselist.get(i);
+ }
+ }
+
+ newArray[posIndex] = val;
+
+ return Arrays.asList(newArray);
+ } else {
+ int posIndex = posInt;
+
+ boolean newPosExtendsArrayLeft = -posIndex > baselist.size();
Review Comment:
@NobiGo yes. you are right. I will fix it.
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