Monty f40ca33bbc Make all #sql temporary table names uniform ...

The reason for this is to make all temporary file names similar and
also to be able to figure out from where a #sql-xxx name orginates.

New format is for most cases:
'#sql-name-current_pid-thread_id[-increment]'
Where name is one of subselect, alter, exchange, temptable or backup

The exceptions are:
ALTER PARTITION shadow files:
'#sql-shadow-thread_id-'original_table_name'

Names used with temp pool:
'#sql-name-current_pid-pool_number'

2020-04-19 17:33:51 +03:00

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