pgsql: Put abbreviation logic into puttuple_common()

Put abbreviation logic into puttuple_common()

Abbreviation code is very similar along tuplesort_put*() functions.  This
commit unifies that code and puts it into puttuple_common().  tuplesort_put*()
functions differs in the abbreviation condition, so it has been added as an
argument to the puttuple_common() function.

Discussion: https://postgr.es/m/CAPpHfdvjix0Ahx-H3Jp1M2R%2B_74P-zKnGGygx4OWr%3DbUQ8BNdw%40mail.gmail.com
Author: Alexander Korotkov
Reviewed-by: Pavel Borisov, Maxim Orlov, Matthias van de Meent
Reviewed-by: Andres Freund, John Naylor

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/033dd02db2248ed792332b950431ced4771b8304

Modified Files
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src/backend/utils/sort/tuplesort.c | 214 ++++++++++---------------------------
1 file changed, 56 insertions(+), 158 deletions(-)