YiwenWu commented on code in PR #3684:
URL: https://github.com/apache/calcite/pull/3684#discussion_r1493743738
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core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java:
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@@ -1074,6 +1080,26 @@ static RelDataType deriveTypeSplit(SqlOperatorBinding
operatorBinding,
.withOperandTypeInference(InferTypes.RETURN_TYPE)
.withKind(SqlKind.CONCAT_WS_MSSQL);
+ /** The "CONCAT_WS(separator[, str | array(str)]+)" function in (SPARK).
+ *
+ * <p>Differs from {@link #CONCAT_WS} (MySQL, Postgres) in that it accepts
+ * 1 arguments
+ *
+ * <ul>
+ * <li>{@code CONCAT_WS(',', 'a', 'b')} returns "{@code a,b}";
+ * <li>{@code CONCAT_WS(null, 'a', 'b')} returns NULL";
+ * <li>{@code CONCAT_WS('s')} returns "";
+ * <li>{@code CONCAT_WS('/', 'a', null, 'b')} returns "{@code a/b}".
+ * </ul> */
+ @LibraryOperator(libraries = {SPARK})
+ public static final SqlFunction CONCAT_WS_SPARK =
+ SqlBasicFunction.create("CONCAT_WS",
+
ReturnTypes.MULTIVALENT_STRING_WITH_SEP_SUM_PRECISION_ARG0_NULLABLE,
Review Comment:
done, add array case
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