feat(StoneDB 8.0): Query_block->braces is deleted by MySQL 8.0 (#593) #594
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Summary about this PR
1 SELECT_LEX->braces is used in MySQL5.7, at optimize part, but deleted in MySQL 8.0
2 in MySQL 8.0, use Query_expression->is_union() instead of SELECT_LEX->braces
Issue Number: close #593
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