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[SPARK-10177] [SQL] fix reading Timestamp in parquet from Hive
We misunderstood the Julian days and nanoseconds of the day in parquet (as TimestampType) from Hive/Impala, they are overlapped, so can't be added together directly. In order to avoid the confusing rounding when do the converting, we use `2440588` as the Julian Day of epoch of unix timestamp (which should be 2440587.5). Author: Davies Liu <davies@databricks.com> Author: Cheng Lian <lian@databricks.com> Closes #8400 from davies/timestamp_parquet. (cherry picked from commit 2f493f7) Signed-off-by: Cheng Lian <lian@databricks.com>
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