dongjoon-hyun commented on a change in pull request #24802: [SPARK-27949][SQL]
Support ANSI SQL grammar `substring(string_expression from n1 [for n2])`
URL: https://github.com/apache/spark/pull/24802#discussion_r291879055
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File path: sql/core/src/test/resources/sql-tests/inputs/string-functions.sql
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@@ -24,3 +24,13 @@ select right(null, -2), right("abcd", -2), right("abcd",
0), right("abcd", 'a');
-- split function
SELECT split('aa1cc2ee3', '[1-9]+');
SELECT split('aa1cc2ee3', '[1-9]+', 2);
+
+--substring function
Review comment:
`--substring` -> `-- substring`
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