[SPARK-4493][SQL] Tests for IsNull / IsNotNull in the ParquetFilterSuite#3748

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liancheng:test-null-filters

Commits on Dec 18, 2014

Adds Parquet filter pushedown tests for IsNull and IsNotNull
liancheng
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Commits on Dec 20, 2014

IsNull and IsNotNull Parquet filter test case for boolean type
liancheng
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