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https://github.com/timescale/timescaledb.git
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7b3929e30d
This optimization will replace the MergeAppendPath for queries on hypertables ordered by the time partitioning column and with a LIMIT clause with an ordered AppendPath. This optimization will remove the need for last point queries to access every chunk of a hypertable. This commit also adds struct TimescaleDBPrivate which is stored in RelOptInfo->fdw_private to store TimescaleDB-specific plan state between different planner hook invocations in the plan. We needed to add TimescaleDBPrivate to store a flag indicating whether or not to use ordered append between different parts of the planner.
40 lines
1.2 KiB
SQL
40 lines
1.2 KiB
SQL
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE for a copy of the license.
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\set ECHO errors
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\set TEST_BASE_NAME plan_ordered_append
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SELECT format('include/%s_load.sql', :'TEST_BASE_NAME') as "TEST_LOAD_NAME",
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format('include/%s_query.sql', :'TEST_BASE_NAME') as "TEST_QUERY_NAME",
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format('%s/results/%s_results_optimized.out', :'TEST_OUTPUT_DIR', :'TEST_BASE_NAME') as "TEST_RESULTS_OPTIMIZED",
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format('%s/results/%s_results_unoptimized.out', :'TEST_OUTPUT_DIR', :'TEST_BASE_NAME') as "TEST_RESULTS_UNOPTIMIZED"
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\gset
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SELECT format('\! diff %s %s', :'TEST_RESULTS_OPTIMIZED', :'TEST_RESULTS_UNOPTIMIZED') as "DIFF_CMD"
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\gset
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\o /dev/null
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SET client_min_messages = 'error';
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\ir :TEST_LOAD_NAME
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RESET client_min_messages;
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\o
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--generate the results into two different files
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SET client_min_messages = 'error';
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\set ECHO none
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--make output contain query results
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\set PREFIX ''
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\o :TEST_RESULTS_OPTIMIZED
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SET timescaledb.ordered_append = 'on';
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\ir :TEST_QUERY_NAME
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\o
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\o :TEST_RESULTS_UNOPTIMIZED
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SET timescaledb.ordered_append = 'off';
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\ir :TEST_QUERY_NAME
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\o
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RESET client_min_messages;
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:DIFF_CMD
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SELECT 'Done';
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