[FLASH-524] Optimize tmt read for single stream #254
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/run-integration-tests |
innerr
reviewed
Sep 26, 2019
| static const __m128i zero16 = _mm_setzero_si128(); | ||
| #endif | ||
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| // pos in columns is made const in MergeTreeDataSelectExecutor::read. |
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No guarantee of the columns‘s order, getting indexes dynamically is necessary
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https://github.com/pingcap/tics/blob/0f3ea5f214a0dde72229c0fc72bdf28462ccbd98/dbms/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp#L223
By now, column: pk version del is definitely at first 3.
innerr
reviewed
Sep 26, 2019
innerr
approved these changes
Sep 26, 2019
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/rebuild |
flowbehappy
reviewed
Sep 26, 2019
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/rebuild |
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TMT is sorted by pk, version, delmark. If there is only one stream, for each group with same pk, we can just select the last one. |
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/rebuild |
1 similar comment
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/rebuild |
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/run-integration-tests |
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/run-integration-tests |
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