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pgbench: add \cset and \gset commands

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These commands allow assignment of values produced by queries to pgbench
variables, where they can be used by further commands.  \gset terminates
a command sequence (just like a bare semicolon); \cset separates
multiple queries in a compound command, like an escaped semicolon (\;).
A prefix can be provided to the \-command and is prepended to the name
of each output column to produce the final variable name.

This feature allows pgbench scripts to react meaningfully to the actual
database contents, allowing more powerful benchmarks to be written.

Authors: Fabien Coelho, Álvaro Herrera
Reviewed-by: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>
Reviewed-by: Stephen Frost <sfrost@snowman.net>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Tatsuo Ishii <ishii@sraoss.co.jp>
Reviewed-by: Rafia Sabih <rafia.sabih@enterprisedb.com>
Discussion: https://postgr.es/m/alpine.DEB.2.20.1607091005330.3412@sto
This commit is contained in:
Alvaro Herrera
2019-01-10 13:42:20 -03:00
parent e1c1d5444e
commit 6260cc550b
6 changed files with 608 additions and 143 deletions
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2
src/include/fe_utils/psqlscan.h
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@@ -90,6 +90,8 @@ extern PsqlScanResult psql_scan(PsqlScanState state,
extern void psql_scan_reset(PsqlScanState state);
extern int psql_scan_get_escaped_semicolons(PsqlScanState state);
extern void psql_scan_reselect_sql_lexer(PsqlScanState state);
extern bool psql_scan_in_quote(PsqlScanState state);