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execScan.c

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    • Tom Lane's avatar
      4cff59d8
      Tweak planner and executor to avoid doing ExecProject() in table scan · 4cff59d8
      Tom Lane authored 
      nodes where it's not really necessary.  In many cases where the scan node
is not the topmost plan node (eg, joins, aggregation), it's possible to
just return the table tuple directly instead of generating an intermediate
projection tuple.  In preliminary testing, this reduced the CPU time
needed for 'SELECT COUNT(*) FROM foo' by about 10%.
      4cff59d8
      History
      Tweak planner and executor to avoid doing ExecProject() in table scan
      Tom Lane authored 
      nodes where it's not really necessary.  In many cases where the scan node
is not the topmost plan node (eg, joins, aggregation), it's possible to
just return the table tuple directly instead of generating an intermediate
projection tuple.  In preliminary testing, this reduced the CPU time
needed for 'SELECT COUNT(*) FROM foo' by about 10%.