[SPARK-23900][SQL] format_number support user specifed format as argument#21010

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wangyum wants to merge 5 commits intoapache:masterfrom wangyum:SPARK-23900

+116-50

Commits on Apr 9, 2018

format_number udf should take user specifed format as argument
wangyum
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Commits on May 2, 2018

Only call $d.toString() once
wangyum
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Commits on May 6, 2018

Add first dValue is the same as the default format test.
wangyum
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Commits on May 28, 2018