# Functions
order=LittleEndian or BigEndian; length is byte num.
Scan a string to parquet value; length and scale just for decimal.
# Constants
From Sparkhttps://github.com/apache/spark/blob/b9f2f78de59758d1932c1573338539e485a01112/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala#L47.
From Sparkhttps://github.com/apache/spark/blob/b9f2f78de59758d1932c1573338539e485a01112/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala#L47.