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[SPARK-21007][SQL] Add SQL function - RIGHT && LEFT
## What changes were proposed in this pull request? Add SQL function - RIGHT && LEFT, same as MySQL: https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_left https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_right ## How was this patch tested? unit test Author: liuxian <liu.xian3@zte.com.cn> Closes #18228 from 10110346/lx-wip-0607.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala 2 additions, 0 deletions...apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala 43 additions, 0 deletions...he/spark/sql/catalyst/expressions/stringExpressions.scala
- sql/core/src/test/resources/sql-tests/inputs/string-functions.sql 6 additions, 0 deletions.../src/test/resources/sql-tests/inputs/string-functions.sql
- sql/core/src/test/resources/sql-tests/results/string-functions.sql.out 33 additions, 1 deletion...test/resources/sql-tests/results/string-functions.sql.out
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