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Add pg_sequences view

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Like pg_tables, pg_views, and others, this view contains information
about sequences in a way that is independent of the system catalog
layout but more comprehensive than the information schema.

To help implement the view, add a new internal function
pg_sequence_last_value() to return the last value of a sequence.  This
is kept separate from pg_sequence_parameters() to separate querying
run-time state from catalog-like information.

Reviewed-by: Andreas Karlsson <andreas@proxel.se>
This commit is contained in:
Peter Eisentraut
2016-11-18 12:00:00 -05:00
parent 8f91f323b4
commit 67dc4ccbb2
10 changed files with 233 additions and 10 deletions
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src/include/commands/sequence.h
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@@ -73,6 +73,7 @@ extern Datum setval3_oid(PG_FUNCTION_ARGS);
extern Datum lastval(PG_FUNCTION_ARGS);
extern Datum pg_sequence_parameters(PG_FUNCTION_ARGS);
extern Datum pg_sequence_last_value(PG_FUNCTION_ARGS);
extern ObjectAddress DefineSequence(ParseState *pstate, CreateSeqStmt *stmt);
extern ObjectAddress AlterSequence(ParseState *pstate, AlterSeqStmt *stmt);