liuyongvs commented on code in PR #3238:
URL: https://github.com/apache/calcite/pull/3238#discussion_r1215554451
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core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
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@@ -3917,6 +3918,38 @@ public static List mapValues(Map map) {
return new ArrayList<>(map.values());
}
+ /** Support the MAP_FROM_ARRAYS function. */
+ public static Map mapFromArrays(List keysArray, List valuesArray) {
+ if (keysArray.size() != valuesArray.size()) {
+ throw new IllegalArgumentException(
+ "Invalid function MAP_FROM_ARRAYS call:\n"
+ + "The length of the keys array "
+ + keysArray.size()
+ + " is not equal to the length of the values array "
+ + valuesArray.size());
+ }
+ final Map map = new LinkedHashMap<>();
+ for (int i = 0; i < keysArray.size(); i++) {
+ map.put(keysArray.get(i), valuesArray.get(i));
+ }
+ return map;
+ }
+
+ /** Support the STR_TO_MAP function. */
+ public static Map strToMap(String string, String stringDelimiter, String
keyValueDelimiter) {
+ final Map map = new LinkedHashMap();
+ final String[] keyValues = string.split(stringDelimiter, -1);
Review Comment:
the limit should be -1, which aligns with spark.
what is the difference with limit -1, you can se here
https://stackabuse.com/how-to-split-a-string-in-java/
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