add syntax support for SELECT ... INTO OUTFILE ... options
#311
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We had parser support for
SELECT ... INTO OUTFILE, but were lacking parser support for the variety ofOUTFILEoptions.This PR adds support for all the options and certain combinations of them.
However, we are missing support for duplicate options and certain orderings of these options; tests for these are added as error tests with a TODO.
MySQL Docs:
https://dev.mysql.com/doc/refman/8.0/en/select-into.html
MariaDB Docs (this has the actual grammar):
https://mariadb.com/kb/en/select-into-outfile/