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Commit 7dbc162f authored by zhaorongsheng's avatar zhaorongsheng Committed by Xiao Li
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[SPARK-20017][SQL] change the nullability of function 'StringToMap' from 'false' to 'true' 

## What changes were proposed in this pull request?

Change the nullability of function `StringToMap` from `false` to `true`.

Author: zhaorongsheng <334362872@qq.com>

Closes #17350 from zhaorongsheng/bug-fix_strToMap_NPE.
parent ae4b91d1
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