yaooqinn opened a new pull request #28284:
URL: https://github.com/apache/spark/pull/28284
…icrosecond and epoch fields support from extract fucntion
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### What changes were proposed in this pull request?
Extracting millennium, century, decade, millisecond, microsecond and epoch
from datetime is neither ANSI standard nor quite common in modern SQL
platforms. None of the systems listing below support these except PostgreSQL.
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF
https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions050.htm
https://prestodb.io/docs/current/functions/datetime.html
https://docs.cloudera.com/documentation/enterprise/5-8-x/topics/impala_datetime_functions.html
https://docs.snowflake.com/en/sql-reference/functions-date-time.html#label-supported-date-time-parts
https://www.postgresql.org/docs/9.1/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
This PR remove these extract fields support from extract function for date
and timestamp values
### Why are the changes needed?
Remove some nonstandard and uncommon features
### Does this PR introduce any user-facing change?
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NO, we should target this to 3.0.0 and these are added during 3.0.0
### How was this patch tested?
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Remove unused tests
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