DRILL-6962: Function coalesce returns an Error when none of the columns in coalesce exist in a parquet file - Updated UntypedNullVector to h…
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DRILL-6962: Function coalesce returns an Error when none of the columns in coalesce exist in a parquet file- Updated UntypedNullVector to hold value count when vector is allocated and transfered to another one;- Updated RecordBatchLoader and DrillCursor to handle case when only UntypedNull values are present in RecordBatch (special case when data buffer is null but actual values are present);- Added functions to cast UntypedNull value to other types for use in UDFs;- Moved UntypedReader, UntypedHolderReaderImpl and UntypedReaderImpl from org.apache.drill.exec.vector.complex.impl to org.apache.drill.exec.vector package.closes #1614
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