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[SPARK-16409][SQL] regexp_extract with optional groups causes NPE
## What changes were proposed in this pull request? regexp_extract actually returns null when it shouldn't when a regex matches but the requested optional group did not. This makes it return an empty string, as apparently designed. ## How was this patch tested? Additional unit test Author: Sean Owen <[email protected]> Closes apache#14504 from srowen/SPARK-16409.
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