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tableam: Move heap-specific logic from needs_toast_table below tableam.

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This allows table AMs to completely suppress TOAST table creation, or
to modify the conditions under which they are created.

Patch by me.  Reviewed by Andres Freund.

Discussion: http://postgr.es/m/CA+Tgmoa4O2n=yphqD2pERUnYmUO84bH1SqMsA-nSxBGsZ7gWfA@mail.gmail.com
This commit is contained in:
Robert Haas
2019-05-21 11:57:13 -04:00
parent cf92226e9f
commit 1171d7d585
3 changed files with 76 additions and 47 deletions
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20
src/include/access/tableam.h
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@@ -573,6 +573,16 @@ typedef struct TableAmRoutine
uint64 (*relation_size) (Relation rel, ForkNumber forkNumber);
/*
* This callback should return true if the relation requires a TOAST table
* and false if it does not. It may wish to examine the relation's
* tuple descriptor before making a decision, but if it uses some other
* method of storing large values (or if it does not support them) it can
* simply return false.
*/
bool (*relation_needs_toast_table) (Relation rel);
/* ------------------------------------------------------------------------
* Planner related functions.
* ------------------------------------------------------------------------
@@ -1585,6 +1595,16 @@ table_relation_size(Relation rel, ForkNumber forkNumber)
return rel->rd_tableam->relation_size(rel, forkNumber);
}
/*
* table_needs_toast_table - does this relation need a toast table?
*/
static inline bool
table_relation_needs_toast_table(Relation rel)
{
return rel->rd_tableam->relation_needs_toast_table(rel);
}
/* ----------------------------------------------------------------------------
* Planner related functionality
* ----------------------------------------------------------------------------