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Tomas Vondra d06215d03b Allow setting statistics target for extended statistics 
When building statistics, we need to decide how many rows to sample and
how accurate the resulting statistics should be. Until now, it was not
possible to explicitly define statistics target for extended statistics
objects, the value was always computed from the per-attribute targets
with a fallback to the system-wide default statistics target.

That's a bit inconvenient, as it ties together the statistics target set
for per-column and extended statistics. In some cases it may be useful
to require larger sample / higher accuracy for extended statics (or the
other way around), but with this approach that's not possible.

So this commit introduces a new command, allowing to specify statistics
target for individual extended statistics objects, overriding the value
derived from per-attribute targets (and the system default).

  ALTER STATISTICS stat_name SET STATISTICS target_value;

When determining statistics target for an extended statistics object we
first look at this explicitly set value. When this value is -1, we fall
back to the old formula, looking at the per-attribute targets first and
then the system default. This means the behavior is backwards compatible
with older PostgreSQL releases.

Author: Tomas Vondra
Discussion: https://postgr.es/m/20190618213357.vli3i23vpkset2xd@development
Reviewed-by: Kirk Jamison, Dean Rasheed
2019-09-11 00:25:51 +02:00
..
.gitignore Replace our traditional initial-catalog-data format with a better design. 2018-04-08 13:17:27 -04:00
binary_upgrade.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
catalog.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
catversion.h Fix issues around strictness of SIMILAR TO. 2019-09-07 14:21:59 -04:00
dependency.h Install dependencies to prevent dropping partition key columns. 2019-07-22 14:55:40 -04:00
duplicate_oids Update copyright for 2019 2019-01-02 12:44:25 -05:00
genbki.h Move the built-in conversions into the initial catalog data. 2019-01-03 19:47:53 -05:00
heap.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
index.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
indexing.h Rework the pg_statistic_ext catalog 2019-06-16 01:20:31 +02:00
Makefile Minor improvements for reformat_dat_file.pl. 2019-03-08 11:48:49 -05:00
namespace.h Fix inconsistencies and typos in the tree, take 10 2019-08-13 13:53:41 +09:00
objectaccess.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
objectaddress.h Don't include utils/array.h from acl.h. 2019-08-16 10:33:30 -07:00
opfam_internal.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
partition.h Fix more typos and inconsistencies in the tree 2019-06-17 16:13:16 +09:00
pg_aggregate.dat Add min() and max() aggregates for pg_lsn 2019-07-05 12:21:11 +09:00
pg_aggregate.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_am.dat tableam: introduce table AM infrastructure. 2019-03-06 09:54:38 -08:00
pg_am.h tableam: introduce table AM infrastructure. 2019-03-06 09:54:38 -08:00
pg_amop.dat Add support for <-> (box, point) operator to SP-GiST box_ops 2019-07-14 15:09:23 +03:00
pg_amop.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_amproc.dat Add sort support routine for the inet data type. 2019-08-01 09:34:14 -07:00
pg_amproc.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_attrdef.h Initial pgindent run for v12. 2019-05-22 12:55:34 -04:00
pg_attribute.h Generated columns 2019-03-30 08:15:57 +01:00
pg_auth_members.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_authid.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_authid.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_cast.dat Add support for multivariate MCV lists 2019-03-27 18:32:18 +01:00
pg_cast.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_class.dat Generated columns 2019-03-30 08:15:57 +01:00
pg_class.h Add BKI_DEFAULT to pg_class.relrewrite 2019-03-14 21:25:39 +01:00
pg_collation.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_collation.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_constraint.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_control.h Add basic infrastructure for 64 bit transaction IDs. 2019-03-28 18:12:20 +13:00
pg_conversion.dat Remove dead encoding-conversion functions. 2019-07-05 14:17:27 -04:00
pg_conversion.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_database.dat Remove remaining hard-wired OID references in the initial catalog data. 2019-03-12 12:30:35 -04:00
pg_database.h Remove remaining hard-wired OID references in the initial catalog data. 2019-03-12 12:30:35 -04:00
pg_db_role_setting.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_default_acl.h Initial pgindent run for v12. 2019-05-22 12:55:34 -04:00
pg_depend.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_description.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_enum.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_event_trigger.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_extension.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_foreign_data_wrapper.h Fix more typos and inconsistencies in the tree 2019-06-17 16:13:16 +09:00
pg_foreign_server.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_foreign_table.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_index.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_inherits.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_init_privs.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_language.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_language.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_largeobject.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_largeobject_metadata.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_namespace.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_namespace.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_opclass.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_opclass.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_operator.dat Add missing commutators for distance operators 2019-07-14 14:55:01 +03:00
pg_operator.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_opfamily.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_opfamily.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_partitioned_table.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_pltemplate.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_pltemplate.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_policy.h Initial pgindent run for v12. 2019-05-22 12:55:34 -04:00
pg_proc.dat Fix issues around strictness of SIMILAR TO. 2019-09-07 14:21:59 -04:00
pg_proc.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_publication.h Remove redundant prototypes for SQL callable functions. 2019-08-16 10:17:32 -07:00
pg_publication_rel.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_range.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_range.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_replication_origin.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_rewrite.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_seclabel.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_sequence.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_shdepend.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_shdescription.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_shseclabel.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_statistic.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_statistic_ext.h Allow setting statistics target for extended statistics 2019-09-11 00:25:51 +02:00
pg_statistic_ext_data.h pgindent run prior to branching v12. 2019-07-01 12:37:52 -04:00
pg_subscription.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_subscription_rel.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_tablespace.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_tablespace.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_transform.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_trigger.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_ts_config.dat Remove remaining hard-wired OID references in the initial catalog data. 2019-03-12 12:30:35 -04:00
pg_ts_config.h Remove remaining hard-wired OID references in the initial catalog data. 2019-03-12 12:30:35 -04:00
pg_ts_config_map.dat Remove remaining hard-wired OID references in the initial catalog data. 2019-03-12 12:30:35 -04:00
pg_ts_config_map.h Remove remaining hard-wired OID references in the initial catalog data. 2019-03-12 12:30:35 -04:00
pg_ts_dict.dat Remove remaining hard-wired OID references in the initial catalog data. 2019-03-12 12:30:35 -04:00
pg_ts_dict.h Remove remaining hard-wired OID references in the initial catalog data. 2019-03-12 12:30:35 -04:00
pg_ts_parser.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_ts_parser.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_ts_template.dat Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_ts_template.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
pg_type.dat Do pre-release housekeeping on catalog data, and fix jsonpath send/recv. 2019-04-28 17:16:50 -04:00
pg_type.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
pg_user_mapping.h Update copyright for 2019 2019-01-02 12:44:25 -05:00
reformat_dat_file.pl Minor improvements for reformat_dat_file.pl. 2019-03-08 11:48:49 -05:00
renumber_oids.pl Create a script that can renumber manually-assigned OIDs. 2019-03-12 10:50:48 -04:00
storage.h Phase 2 pgindent run for v12. 2019-05-22 13:04:48 -04:00
storage_xlog.h Fix several recently introduced issues around handling new relation forks. 2019-04-29 19:28:05 -07:00
toasting.h Rework the pg_statistic_ext catalog 2019-06-16 01:20:31 +02:00
unused_oids Show specific OID suggestion in unused_oids output. 2019-08-05 11:47:34 -07:00