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https://github.com/HypoPG/hypopg
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Fixup for index hiding patch.
Fix compatibility for pg12- servers, and while at it remove some uncessary trailing whitespaces.
This commit is contained in:
Julien Rouhaud
parent
351f14a79d
commit
9385d5e25e
4 changed files with 26 additions and 22 deletions
16
README.md
16
README.md
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@ -109,7 +109,7 @@ Create two real indexes and run `EXPLAIN`:
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rjuju=# CREATE INDEX ON hypo(id);
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rjuju=# CREATE INDEX ON hypo(id, val);
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rjuju=# EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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----------------------------------------------------------------------------------
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Index Only Scan using hypo_id_val_idx on hypo (cost=0.29..8.30 rows=1 width=13)
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Index Cond: (id = 1)
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@ -119,7 +119,7 @@ The query plan is using the `hypo_id_val_idx` index. Use `hypopg_hide_index(oid)
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rjuju=# SELECT hypopg_hide_index('hypo_id_val_idx'::REGCLASS);
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rjuju=# EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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-------------------------------------------------------------------------
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Index Scan using hypo_id_idx on hypo (cost=0.29..8.30 rows=1 width=13)
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Index Cond: (id = 1)
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@ -129,7 +129,7 @@ The query plan is using the other index `hypo_id_idx` now. Use `hypopg_hide_inde
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rjuju=# SELECT hypopg_hide_index('hypo_id_idx'::REGCLASS);
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rjuju=# EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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-------------------------------------------------------
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Seq Scan on hypo (cost=0.00..180.00 rows=1 width=13)
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Filter: (id = 1)
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@ -139,7 +139,7 @@ And now the query plan changes back to `Seq Scan`. Use `hypopg_unhide_index(oid)
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rjuju=# SELECT hypopg_unhide_index('hypo_id_idx'::regclass);
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rjuju=# EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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-------------------------------------------------------------------------
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Index Scan using hypo_id_idx on hypo (cost=0.29..8.30 rows=1 width=13)
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Index Cond: (id = 1)
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@ -149,7 +149,7 @@ Of course, you can also hide hypothetical indexes:
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rjuju=# SELECT hypopg_create_index('CREATE INDEX ON hypo(id)');
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rjuju=# EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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------------------------------------------------------------------------------------
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Index Scan using "<12659>btree_hypo_id" on hypo (cost=0.04..8.05 rows=1 width=13)
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Index Cond: (id = 1)
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@ -157,7 +157,7 @@ Of course, you can also hide hypothetical indexes:
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rjuju=# SELECT hypopg_hide_index(12659);
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rjuju=# EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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-------------------------------------------------------
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Seq Scan on hypo (cost=0.00..180.00 rows=1 width=13)
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Filter: (id = 1)
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@ -166,7 +166,7 @@ Of course, you can also hide hypothetical indexes:
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You can check which indexes are hidden using `hypopg_hidden_indexes()` or the `hypopg_hidden_indexes` view:
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rjuju=# SELECT * FROM hypopg_hidden_indexes();
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indexid
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indexid
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---------
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526604
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526603
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@ -183,4 +183,4 @@ You can check which indexes are hidden using `hypopg_hidden_indexes()` or the `h
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To restore all existing indexes, you can use the function `hypopg_unhide_all_indexes()`.
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Note that the functionality to hide existing indexes only applies to the EXPLAIN command in the current session
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and will not affect other sessions.
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and will not affect other sessions.
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@ -1,4 +1,4 @@
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.. title:: HypoPG: Hypothetical indexes for PostgreSQL
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.. title:: HypoPG: Hypothetical indexes for PostgreSQL
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HypoPG
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======
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@ -244,7 +244,7 @@ As a simple case, let's consider two indexes:
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:emphasize-lines: 4
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EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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----------------------------------------------------------------------------------
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Index Only Scan using hypo_id_val_idx on hypo (cost=0.29..8.30 rows=1 width=13)
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Index Cond: (id = 1)
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@ -259,13 +259,13 @@ The query plan is using the **hypo_id_val_idx** index now.
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:emphasize-lines: 10
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SELECT hypopg_hide_index('hypo_id_val_idx'::REGCLASS);
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hypopg_hide_index
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hypopg_hide_index
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-------------------
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t
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(1 row)
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EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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-------------------------------------------------------------------------
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Index Scan using hypo_id_idx on hypo (cost=0.29..8.30 rows=1 width=13)
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Index Cond: (id = 1)
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@ -278,13 +278,13 @@ To continue testing, use the **hypopg_hide_index(oid)** function to hide another
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:emphasize-lines: 10
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SELECT hypopg_hide_index('hypo_id_idx'::REGCLASS);
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hypopg_hide_index
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hypopg_hide_index
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-------------------
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t
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(1 row)
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EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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-------------------------------------------------------
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Seq Scan on hypo (cost=0.00..180.00 rows=1 width=13)
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Filter: (id = 1)
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@ -303,7 +303,7 @@ To continue testing, use the **hypopg_hide_index(oid)** function to hide another
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(1 row)
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EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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-------------------------------------------------------------------------
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Index Scan using hypo_id_idx on hypo (cost=0.29..8.30 rows=1 width=13)
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Index Cond: (id = 1)
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@ -316,7 +316,7 @@ To continue testing, use the **hypopg_hide_index(oid)** function to hide another
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.. code-block:: psql
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SELECT * FROM hypopg_hidden_indexes();
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indexid
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indexid
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---------
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526604
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(1 rows)
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@ -339,13 +339,13 @@ To continue testing, use the **hypopg_hide_index(oid)** function to hide another
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:emphasize-lines: 10
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SELECT hypopg_create_index('CREATE INDEX ON hypo(id)');
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hypopg_create_index
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hypopg_create_index
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------------------------------
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(12659,<12659>btree_hypo_id)
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(1 row)
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EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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------------------------------------------------------------------------------------
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Index Scan using "<12659>btree_hypo_id" on hypo (cost=0.04..8.05 rows=1 width=13)
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Index Cond: (id = 1)
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@ -363,7 +363,7 @@ Now that the hypothetical index is being used, we can try hiding it to see the c
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(1 row)
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EXPLAIN SELECT * FROM hypo WHERE id = 1;
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QUERY PLAN
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QUERY PLAN
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-------------------------------------------------------------------------
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Index Scan using hypo_id_idx on hypo (cost=0.29..8.30 rows=1 width=13)
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Index Cond: (id = 1)
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@ -389,4 +389,4 @@ Now that the hypothetical index is being used, we can try hiding it to see the c
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indexrelid | index_name | schema_name | table_name | am_name | is_hypo
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-------------+----------------------+-------------+------------+---------+---------
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526604 | hypo_id_val_idx | public | hypo | btree | f
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(2 rows)
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(2 rows)
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@ -1695,7 +1695,11 @@ hypopg_hidden_indexes(PG_FUNCTION_ARGS)
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oldcontext = MemoryContextSwitchTo(rsinfo->econtext->ecxt_per_query_memory);
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tupdesc = CreateTemplateTupleDesc(1);
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tupdesc = CreateTemplateTupleDesc(1
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#if PG_VERSION_NUM < 120000
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, false
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#endif
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);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "indexid", OIDOID, -1, 0);
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tupstore = tuplestore_begin_heap(true, false, work_mem);
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