List:Internals« Previous MessageNext Message »
From:Dan Meany Date:August 3 2010 3:41pm
Subject:64 table join limit
View as plain text  
The 64 table limit on joins was discussed with a proposed solution based on the change to
key_map in the thread 16713 some time ago:

This has become much more of a constraint when implementing a partly schemaless design
with an attribute table (ala couchDb etc.) where you might need a self-join for every
field in the logical table.  I noticed the declaration ulonglong table_map is still in
both 5.1 and 5.4 vs. key_map which is Bitmap<64>.  I wonder if anyone has an opinion
if this is a safe change to make for table_map?

64 table join limitDan Meany3 Aug
  • Re: 64 table join limitMARK CALLAGHAN3 Aug
    • Re: 64 table join limitDan Meany3 Aug