[Spark-19726][SQL] Faild to insert null timestamp value to mysql using spark jdbc#18445

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shuangshuangwang wants to merge 11 commits intoapache:masterfrom

shuangshuangwang:SPARK-19726

Commits on Jun 27, 2017

Spark-19726: Insert into null timestamp value into mysql use null instead of spark_default_timestamp_value
YIHAODIAN\wangshuangshuang
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Commits on Jun 28, 2017

Spark-19726: modify unit tests to expect catch exception
YIHAODIAN\wangshuangshuang
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Spark-19726: modify unit tests tablename same with jdbc
YIHAODIAN\wangshuangshuang
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Spark-19726: add a new boolean parameter alwaysNullable to getSchema
YIHAODIAN\wangshuangshuang
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Spark-19726: fix scala style checks error
YIHAODIAN\wangshuangshuang
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Spark-19726: fix scala style checks error
YIHAODIAN\wangshuangshuang
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Spark-19726: alwaysNullable as a parameter for getSchema
YIHAODIAN\wangshuangshuang
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Spark-19726: fix scala style checks errors according to scala-style-guide
YIHAODIAN\wangshuangshuang
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Commits on Jun 30, 2017

SPARK-19726: change the value to true in the caller side
shuangshuangwang
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Commits on Jul 3, 2017

SPARK-19726: true to alwaysNullable equals true in JdbcUtils.getSchema
shuangshuangwang
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Commits on Jul 4, 2017

SPARK-19726: alwaysNullable and nullable is different
shuangshuangwang
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