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8f9b9590d7
The proc array can contain duplicate XIDs, when a transaction is just being prepared for two-phase commit. To cope, remove any duplicates in txid_current_snapshot(). Also ignore duplicates in the input functions, so that if e.g. you have an old pg_dump file that already contains duplicates, it will be accepted. Report and fix by Jan Wieck. Backpatch to all supported versions.
54 lines
1.8 KiB
SQL
54 lines
1.8 KiB
SQL
-- txid_snapshot data type and related functions
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-- i/o
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select '12:13:'::txid_snapshot;
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select '12:18:14,16'::txid_snapshot;
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select '12:16:14,14'::txid_snapshot;
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-- errors
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select '31:12:'::txid_snapshot;
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select '0:1:'::txid_snapshot;
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select '12:13:0'::txid_snapshot;
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select '12:16:14,13'::txid_snapshot;
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create temp table snapshot_test (
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nr integer,
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snap txid_snapshot
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);
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insert into snapshot_test values (1, '12:13:');
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insert into snapshot_test values (2, '12:20:13,15,18');
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insert into snapshot_test values (3, '100001:100009:100005,100007,100008');
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insert into snapshot_test values (4, '100:150:101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131');
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select snap from snapshot_test order by nr;
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select txid_snapshot_xmin(snap),
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txid_snapshot_xmax(snap),
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txid_snapshot_xip(snap)
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from snapshot_test order by nr;
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select id, txid_visible_in_snapshot(id, snap)
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from snapshot_test, generate_series(11, 21) id
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where nr = 2;
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-- test bsearch
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select id, txid_visible_in_snapshot(id, snap)
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from snapshot_test, generate_series(90, 160) id
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where nr = 4;
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-- test current values also
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select txid_current() >= txid_snapshot_xmin(txid_current_snapshot());
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-- we can't assume current is always less than xmax, however
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select txid_visible_in_snapshot(txid_current(), txid_current_snapshot());
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-- test 64bitness
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select txid_snapshot '1000100010001000:1000100010001100:1000100010001012,1000100010001013';
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select txid_visible_in_snapshot('1000100010001012', '1000100010001000:1000100010001100:1000100010001012,1000100010001013');
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select txid_visible_in_snapshot('1000100010001015', '1000100010001000:1000100010001100:1000100010001012,1000100010001013');
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-- test 64bit overflow
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SELECT txid_snapshot '1:9223372036854775807:3';
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SELECT txid_snapshot '1:9223372036854775808:3';
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