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Commit 0578ff96 authored by Sean Owen's avatar Sean Owen
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[SPARK-16324][SQL] regexp_extract should doc that it returns empty string when match fails 

## What changes were proposed in this pull request?

Doc that regexp_extract returns empty string when regex or group does not match

## How was this patch tested?

Jenkins test, with a few new test cases

Author: Sean Owen <sowen@cloudera.com>

Closes #14525 from srowen/SPARK-16324.
parent eca58755
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