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Peter Eisentraut
2010-08-17 04:37:21 +00:00
parent ee0e525bfc
commit 5194b9d049
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doc/src/sgml/arch-dev.sgml
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<!-- $PostgreSQL: pgsql/doc/src/sgml/arch-dev.sgml,v 2.34 2010/04/03 07:22:52 petere Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/arch-dev.sgml,v 2.35 2010/08/17 04:37:20 petere Exp $ -->
<chapter id="overview">
<title>Overview of PostgreSQL Internals</title>
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needed, plus any auxiliary steps needed, such as sort nodes or
aggregate-function calculation nodes. Most of these plan node
types have the additional ability to do <firstterm>selection</>
(discarding rows that do not meet a specified boolean condition)
(discarding rows that do not meet a specified Boolean condition)
and <firstterm>projection</> (computation of a derived column set
based on given column values, that is, evaluation of scalar
expressions where needed). One of the responsibilities of the