Add support for IntervalStyle::MySQL #18
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sgrebnov
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… ParquetOpener (apache#15561) * parquet reader: move pruning predicate creation from ParquetSource to ParquetOpener * use file schema, avoid loading page index if unecessary * Add comment * add comment * Add comment * remove check * fix clippy * update sqllogictest * restore to explain plans * reverted * modify access * Fix ArrowReaderOptions should read with physical_file_schema so we do… (#17) * Fix ArrowReaderOptions should read with physical_file_schema so we don't need to cast back to utf8 * Fix fmt * Update opener.rs * Always apply per-file schema during parquet read (#18) * Update datafusion/datasource-parquet/src/opener.rs --------- Co-authored-by: Qi Zhu <821684824@qq.com> Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
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Which issue does this PR close?
PR implements support for
IntervalStyle::MySQLThis fixes spiceai/spiceai#1950
MySQL Interval specification: https://dev.mysql.com/doc/refman/8.4/en/expressions.html#temporal-intervals
Note:
MySQL supports theDAY_MICROSECONDunit type (format isDAYS HOURS:MINUTES:SECONDS.MICROSECONDS), which can be used to optimize the number ofINTERVALelements for complex cases. The decision to use the current version (separateINTERVALs) is made to provide cleaner SQL for typical scenarios where only a fewINTERVALelements are used (day, hours, etc.).The implementation has been updated to generate single INTERVAL expression as generated intervals sequence can't be wrapped in brackets - (INTERVAL 1 YEAR + INTERVAL 1 MONTH ...) so we need single expression so it works correct for interval subtraction cases