WL#4971: select_number need not be generated before it is used
Affects: WorkLog-3.4 — Status: Un-Assigned
The select_number field inside st_select_lex is only required for EXPLAIN functionality. Hence, it can probably be generated locally inside select_describe() and related functions. The select_number field in st_select_lex object and the global counter in thd/ lex can thus be eliminated.
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