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e1551f96e6
Tuple conversion support in tupconvert.c is able to convert rowtypes between two relations, inner and outer, which are logically equivalent but have a different ordering or even dropped columns (used mainly for inheritance tree and partitions). This makes use of attribute mappings, which are simple arrays made of AttrNumber elements with a length matching the number of attributes of the outer relation. The length of the attribute mapping has been treated as completely independent of the mapping itself until now, making it easy to pass down an incorrect mapping length. This commit refactors the code related to attribute mappings and moves it into an independent facility called attmap.c, extracted from tupconvert.c. This merges the attribute mapping with its length, avoiding to try to guess what is the length of a mapping to use as this is computed once, when the map is built. This will avoid mistakes like what has been fixed in dc816e58, which has used an incorrect mapping length by matching it with the number of attributes of an inner relation (a child partition) instead of an outer relation (a partitioned table). Author: Michael Paquier Reviewed-by: Amit Langote Discussion: https://postgr.es/m/20191121042556.GD153437@paquier.xyz
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* logicalrelation.h
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* Relation definitions for logical replication relation mapping.
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*
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* Portions Copyright (c) 2016-2019, PostgreSQL Global Development Group
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*
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* src/include/replication/logicalrelation.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef LOGICALRELATION_H
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#define LOGICALRELATION_H
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#include "access/attmap.h"
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#include "replication/logicalproto.h"
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typedef struct LogicalRepRelMapEntry
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{
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LogicalRepRelation remoterel; /* key is remoterel.remoteid */
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/* Mapping to local relation, filled as needed. */
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Oid localreloid; /* local relation id */
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Relation localrel; /* relcache entry */
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AttrMap *attrmap; /* map of local attributes to remote ones */
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bool updatable; /* Can apply updates/deletes? */
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/* Sync state. */
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char state;
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XLogRecPtr statelsn;
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} LogicalRepRelMapEntry;
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extern void logicalrep_relmap_update(LogicalRepRelation *remoterel);
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extern LogicalRepRelMapEntry *logicalrep_rel_open(LogicalRepRelId remoteid,
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LOCKMODE lockmode);
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extern void logicalrep_rel_close(LogicalRepRelMapEntry *rel,
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LOCKMODE lockmode);
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extern void logicalrep_typmap_update(LogicalRepTyp *remotetyp);
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extern char *logicalrep_typmap_gettypname(Oid remoteid);
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#endif /* LOGICALRELATION_H */
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