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Support Avg distinct for decimal and float type - #15414
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qazxcdswe123 wants to merge 7 commits into
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| let sum_scalar = self.sum_accumulator.evaluate()?; | ||
| match sum_scalar { | ||
| ScalarValue::Decimal128(Some(sum), _, _) => { |
ContributorAuthor
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Even though I prefer a generic solution like
I couldn't find a way to convert ScalarValue to Primitive.
And I also think this solution is acceptable
| )?; | ||
| // `distinct_count` returns `u64`, but `avg` expects `i256` | ||
| // first convert `u64` to `i128`, then convert `i128` to `i256` to avoid overflow | ||
| let distinct_cnt: i128 = self.sum_accumulator.distinct_count() as i128; |
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this is awkward but can prevent overflow
| group1 NULL Int32 | ||
| statement ok | ||
| create table t_decimal (c decimal(10, 4)) as values (100.00), (125.00), (175.00), (200.00), (200.00), (300.00), (null), (null); |
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This tests are not reliable as single_distinct_to_groupby is still there
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2ee004dCompareOmega359
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Mar 25, 2025
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FYI, the sqlite tests have a number of avg(distinct) queries that will need to be updated. See the README for details. |
alamb
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March 25, 2025 20:30
Omega359
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May 23, 2025
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@qazxcdswe123 - Is there a reason why you closed this issue rather than update the tests? |
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Which issue does this PR close?
float64type #15413avg(distinct)support #2408Rationale for this change
float64type #15413, SHOULD MERGE THAT FIRSTDistinctSumAccumulatorto calculate decimalWhat changes are included in this PR?
float64type #15413 andDecimalDistinctAvgAccumulatorimplematation usingDistinctSumAccumulatorsingle_distinct_to_groupbyrule have not been rm, sqllogictest is not accurate so I added tests indecimal.rsAre these changes tested?
Yes, sqllogictest and rust tests
Are there any user-facing changes?
No