[Docs] Add Materialized view manual #4229
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EmmyMiao87
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kind/docs
wutiangan
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Aug 2, 2020
wutiangan
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Aug 2, 2020
wutiangan
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Aug 2, 2020
wutiangan
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Aug 2, 2020
wutiangan
reviewed
Aug 2, 2020
| 1. 物化视图的聚合函数的参数不支持表达式仅支持单列，比如： sum(a+b)不支持。 | ||
| 2. 如果删除语句的条件列，在物化视图中不存在，则不能进行删除操作。如果一定要删除数据，则需要先将物化视图删除，然后方可删除数据。 | ||
| 3. 单表上过多的物化视图会影响导入的效率：导入数据时，物化视图和 base 表数据是同步更新的，如果一张表的物化视图表超过10张，则有可能导致导入速度很慢。这就像单次导入需要同时导入10张表数据是一样的。 | ||
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- the same column with two aggregate funciton(select sum(a), count(a)) can't be support now
- aggregation model's table can't support hll_union/bitmap_union/count
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aggregation model's table also support hll_union/bitmap_union/count
morningman
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Aug 2, 2020
wutiangan
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Aug 3, 2020
Add usage manual of materialized view in Chinese and English Change-Id: Id7dc1a1e0f7b8e13ac12c9524b7b8f3ca5814873
morningman
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Aug 3, 2020
| | bitmap\_union | bitmap\_union, bitmap\_union\_count, count(distinct) | | ||
| | hll\_union | hll\_raw\_agg, hll\_union\_agg, ndv() | | ||
| | bitmap\_union | bitmap\_union, bitmap\_union\_count, count(distinct) | | ||
| | hll\_union | hll\_raw\_agg, hll\_union\_agg, ndv, approx_count_distinct | |
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Suggested change
| | hll\_union | hll\_raw\_agg, hll\_union\_agg, ndv, approx_count_distinct | | |
| | hll\_union | hll\_raw\_agg, hll\_union\_agg, ndv, approx\_count\_distinct | |
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…p failures and 'key not found' errors (apache#50766) (apache#4065) (apache#4229) Related PR: apache#50037 If an error occurs during transaction label recycling, the vector recording keys cannot be cleaned up. Keys that were already cleaned up in the previous scan and recycle cycle will be carried over to the next scan and recycle cycle, causing a large number of 'key not found' errors.
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Change-Id: Id7dc1a1e0f7b8e13ac12c9524b7b8f3ca5814873
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Add usage manual of materialized view in Chinese and English
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