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trigger.c

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    • Tom Lane's avatar
      68893035
      Redefine the lp_flags field of item pointers as having four states, rather · 68893035
      Tom Lane authored 
      than two independent bits (one of which was never used in heap pages anyway,
or at least hadn't been in a very long time).  This gives us flexibility to
add the HOT notions of redirected and dead item pointers without requiring
anything so klugy as magic values of lp_off and lp_len.  The state values
are chosen so that for the states currently in use (pre-HOT) there is no
change in the physical representation.
      68893035
      History
      Redefine the lp_flags field of item pointers as having four states, rather
      Tom Lane authored 
      than two independent bits (one of which was never used in heap pages anyway,
or at least hadn't been in a very long time).  This gives us flexibility to
add the HOT notions of redirected and dead item pointers without requiring
anything so klugy as magic values of lp_off and lp_len.  The state values
are chosen so that for the states currently in use (pre-HOT) there is no
change in the physical representation.
    trigger.c 93.77 KiB