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f933766ba7
pgsql-hackers. pg_opclass now has a row for each opclass supported by each index AM, not a row for each opclass name. This allows pg_opclass to show directly whether an AM supports an opclass, and furthermore makes it possible to store additional information about an opclass that might be AM-dependent. pg_opclass and pg_amop now store "lossy" and "haskeytype" information that we previously expected the user to remember to provide in CREATE INDEX commands. Lossiness is no longer an index-level property, but is associated with the use of a particular operator in a particular index opclass. Along the way, IndexSupportInitialize now uses the syscaches to retrieve pg_amop and pg_amproc entries. I find this reduces backend launch time by about ten percent, at the cost of a couple more special cases in catcache.c's IndexScanOK. Initial work by Oleg Bartunov and Teodor Sigaev, further hacking by Tom Lane. initdb forced.
108 lines
2.2 KiB
C
108 lines
2.2 KiB
C
/*
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* findoidjoins.c, requires src/interfaces/libpgeasy
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*
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*/
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#include "postgres_fe.h"
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#include "libpq-fe.h"
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#include "halt.h"
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#include "libpgeasy.h"
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PGresult *attres,
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*relres;
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int
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main(int argc, char **argv)
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{
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char query[4000];
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char relname[256];
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char relname2[256];
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char attname[256];
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char typname[256];
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int count;
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char optstr[256];
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if (argc != 2)
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halt("Usage: %s database\n", argv[0]);
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snprintf(optstr, 256, "dbname=%s", argv[1]);
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connectdb(optstr);
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on_error_continue();
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on_error_stop();
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doquery("BEGIN WORK");
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doquery("\
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DECLARE c_attributes BINARY CURSOR FOR \
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SELECT typname, relname, a.attname \
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FROM pg_class c, pg_attribute a, pg_type t \
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WHERE a.attnum > 0 AND \
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relkind = 'r' AND \
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(typname = 'oid' OR \
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typname = 'regproc') AND \
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a.attrelid = c.oid AND \
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a.atttypid = t.oid \
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ORDER BY 2, a.attnum ; \
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");
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doquery("FETCH ALL IN c_attributes");
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attres = get_result();
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doquery("\
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DECLARE c_relations BINARY CURSOR FOR \
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SELECT relname \
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FROM pg_class c \
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WHERE relkind = 'r' AND relhasoids \
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ORDER BY 1; \
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");
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doquery("FETCH ALL IN c_relations");
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relres = get_result();
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set_result(attres);
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while (fetch(typname, relname, attname) != END_OF_TUPLES)
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{
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set_result(relres);
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reset_fetch();
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while (fetch(relname2) != END_OF_TUPLES)
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{
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unset_result(relres);
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if (strcmp(typname, "oid") == 0)
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sprintf(query, "\
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DECLARE c_matches BINARY CURSOR FOR \
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SELECT count(*)::int4 \
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FROM \"%s\" t1, \"%s\" t2 \
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WHERE t1.\"%s\" = t2.oid ",
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relname, relname2, attname);
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else
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sprintf(query, "\
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DECLARE c_matches BINARY CURSOR FOR \
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SELECT count(*)::int4 \
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FROM \"%s\" t1, \"%s\" t2 \
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WHERE RegprocToOid(t1.\"%s\") = t2.oid ",
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relname, relname2, attname);
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doquery(query);
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doquery("FETCH ALL IN c_matches");
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fetch(&count);
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if (count != 0)
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printf("Join %s.%s => %s.oid\n", relname, attname, relname2);
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doquery("CLOSE c_matches");
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set_result(relres);
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}
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set_result(attres);
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}
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set_result(relres);
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doquery("CLOSE c_relations");
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PQclear(relres);
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set_result(attres);
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doquery("CLOSE c_attributes");
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PQclear(attres);
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unset_result(attres);
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doquery("COMMIT WORK");
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disconnectdb();
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return 0;
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}
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