hanyuzheng7 commented on code in PR #22785:
URL: https://github.com/apache/flink/pull/22785#discussion_r1242996736
##########
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/internal/BaseExpressions.java:
##########
@@ -1408,6 +1409,24 @@ public OutType arrayUnion(InType array) {
unresolvedCall(ARRAY_UNION, toExpr(),
objectToExpression(array)));
}
+ /**
+ * Returns a string that represents the concatenation of the elements in
the given array and the
+ * elements' data type in the given array is string. The `delimiter` is a
string that separates
+ * each pair of consecutive elements of the array. The optional
`nullReplacement` is a string
+ * that replaces null elements in the array.
+ *
+ * <p>Returns null if input array or delimiter or nullReplacement are null.
+ */
+ public OutType arrayJoin(InType delimiter, InType... nullReplacement) {
Review Comment:
fixed it.
##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/BuiltInFunctionDefinitions.java:
##########
@@ -285,6 +286,20 @@ ANY, and(logical(LogicalTypeRoot.BOOLEAN), LITERAL)
"org.apache.flink.table.runtime.functions.scalar.ArrayUnionFunction")
.build();
+ public static final BuiltInFunctionDefinition ARRAY_JOIN =
+ BuiltInFunctionDefinition.newBuilder()
+ .name("ARRAY_JOIN")
+ .kind(SCALAR)
+ .inputTypeStrategy(
+ varyingSequence(
+ new
ArrayOfStringArgumentTypeStrategy("ARRAY<STRING>"),
+
logical(LogicalTypeFamily.CHARACTER_STRING),
+
logical(LogicalTypeFamily.CHARACTER_STRING)))
Review Comment:
fixed it.
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