From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
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To: | mohsen soodkhah mohammadi <mohsensoodkhah(at)gmail(dot)com> |
Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: when construct new tuple for update? |
Date: | 2013-09-19 04:52:58 |
Message-ID: | CAA4eK1L-K-3Dz_v=u6WaJmvMDxDQh-_2YMAFme1zVE9UWABaxg@mail.gmail.com |
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Lists: | pgsql-hackers |
On Wed, Sep 18, 2013 at 2:21 PM, mohsen soodkhah mohammadi
<mohsensoodkhah(at)gmail(dot)com> wrote:
> hi
> I want that find where did a new tuple data construct in postgresql code
> when query is update.
> I find that ExecModiryTable is an upper function for do it. but I want to
> find exact place that create the data of one row of table.
heap_form_tuple() construct a new tuple from the given values[] and
isnull[] arrays and incase of UPDATE operation, it gets called in
below call stack
ExecModifyTable()->ExecUpdate()->ExecMaterializeSlot()->ExecCopySlotTuple()->heap_form_tuple()
Values to construct new tuple are formed during projection in
ExecProject() which is called as below call stack in UPDATE operation:
ExecModifyTable()->ExecProcNode()->ExecSeqScan()->ExecScan()->ExecProject()
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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