Gengliang Wang 3029e62a82 [SPARK-36445][SQL] ANSI type coercion rule for date time operations ... ### What changes were proposed in this pull request? Implement a new rule for the date-time operations in the ANSI type coercion system: 1. Date will be converted to Timestamp when it is in the subtraction with Timestmap. 2. Promote string literals in date_add/date_sub/time_add ### Why are the changes needed? Currently the type coercion rule `DateTimeOperations` doesn't match the design of the ANSI type coercion system: 1. For date_add/date_sub, if the input is timestamp type, Spark should not convert it into date type since date type is narrower than the timestamp type. 2. For date_add/date_sub/time_add, string value can be implicit cast to date/timestamp only when it is literal. Thus, we need to have a new rule for the date-time operations in the ANSI type coercion system. ### Does this PR introduce _any_ user-facing change? No, the ANSI type coercion rules are not releaesd. ### How was this patch tested? New UT Closes #33666 from gengliangwang/datetimeOp. Authored-by: Gengliang Wang <gengliang@apache.org> Signed-off-by: Gengliang Wang <gengliang@apache.org>		2021-08-11 11:55:45 +08:00
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main	[SPARK-36463][SS] Prohibit update mode in streaming aggregation with session window	2021-08-11 10:45:52 +09:00
test	[SPARK-36445][SQL] ANSI type coercion rule for date time operations	2021-08-11 11:55:45 +08:00