MDEV-38136: Prevent elimination of tables in a FULL OUTER JOIN #4454
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Prevent elimination of tables participating in a FULL OUTER JOIN during eliminate_tables as part of phase one FULL OUTER JOIN development. Move the functionality gate for FULL JOIN further into the codebase: convert LEX::has_full_outer_join to a counter so we can see how many FULL JOINs remain which makes the gate work correctly after simplify_joins and eliminate_tables are called. Fixes an old bug where, when running the server as a debug build and in debug mode, a null pointer deference in Dep_analysis_context::dbug_print_deps would cause a crash.
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Prevent elimination of tables participating in a FULL OUTER JOIN during eliminate_tables as part of phase one FULL OUTER JOIN development.