amaliujia commented on a change in pull request #11895:
URL: https://github.com/apache/beam/pull/11895#discussion_r434081404
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File path:
sdks/java/extensions/sql/zetasql/src/test/java/org/apache/beam/sdk/extensions/sql/zetasql/ZetaSQLDialectSpecTest.java
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@@ -3130,6 +3130,23 @@ public void testUnnestArrayColumn() {
pipeline.run().waitUntilFinish(Duration.standardMinutes(PIPELINE_EXECUTION_WAITTIME_MINUTES));
}
+ @Test
+ public void testStringAggregation() {
+ String sql =
+ "SELECT STRING_AGG(fruit) AS string_agg"
+ + " FROM UNNEST([\"apple\", \"pear\", NULL, \"banana\", \"pear\"])
AS fruit";
Review comment:
In fact, I think it was a decision to not handle NULL in string coder.
So the easiest way to move forward is to not include `NULL` in your test
case, and leave a comment to say that `STRING_AGG` does not handle `NULL` value
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