Hello
this patch remove a multiple detoasting of varlena values in plpgsql.
It is usable mainly for iteration over longer array directly loaded
from relation.
It's doesn't have a impact on semantic or behave - it's just eliminate
some performance trap.
sample: table 10000 rows one column with array with 1000 string fields:
patched pl time: 6 sec
unpatched pl time: 170 sec
This doesn't change my opinion on FOR-IN-ARRAY cycle (is still
important for readability) - just remove one critical performance
issue
Regards
Pavel Stehule
