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tianchenMicah Kornfield
1abf18ff902
tianchen authored and Micah Kornfield committed 330dbff4be5
ARROW-5968: [Java] Remove duplicate Preconditions check in JDBC adapter

Related to [ARROW-5968](https://issues.apache.org/jira/browse/ARROW-5968).
Some Preconditions check are duplicate in JdbcToArrow#sqlToArrow

Author: tianchen <niki.lj@alibaba-inc.com>

Closes #4896 from tianchen92/jdbc_adapter and squashes the following commits:

0b507ea11 <tianchen> remove duplicated check