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tableam: Support for an index build's initial table scan(s).

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To support building indexes over tables of different AMs, the scans to
do so need to be routed through the table AM.  While moving a fair
amount of code, nearly all the changes are just moving code to below a
callback.

Currently the range based interface wouldn't make much sense for non
block based table AMs. But that seems aceptable for now.

Author: Andres Freund
Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de
This commit is contained in:
Andres Freund
2019-03-27 19:59:06 -07:00
parent 12bb35fc9b
commit 2a96909a4a
14 changed files with 1012 additions and 936 deletions
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doc/src/sgml/indexam.sgml
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@@ -238,7 +238,7 @@ ambuild (Relation heapRelation,
but is empty. It must be filled in with whatever fixed data the
access method requires, plus entries for all tuples already existing
in the table. Ordinarily the <function>ambuild</function> function will call
<function>IndexBuildHeapScan()</function> to scan the table for existing tuples
<function>table_index_build_scan()</function> to scan the table for existing tuples
and compute the keys that need to be inserted into the index.
The function must return a palloc'd struct containing statistics about
the new index.