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| 1 | +// Copyright 2021 Datafuse Labs |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +// you may not use this file except in compliance with the License. |
| 5 | +// You may obtain a copy of the License at |
| 6 | +// |
| 7 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +// |
| 9 | +// Unless required by applicable law or agreed to in writing, software |
| 10 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +// See the License for the specific language governing permissions and |
| 13 | +// limitations under the License. |
| 14 | + |
| 15 | +use std::marker::PhantomData; |
| 16 | + |
| 17 | +use borsh::BorshDeserialize; |
| 18 | +use borsh::BorshSerialize; |
| 19 | +use databend_common_arrow::arrow::bitmap::Bitmap; |
| 20 | +use databend_common_exception::Result; |
| 21 | +use databend_common_expression::types::decimal::*; |
| 22 | +use databend_common_expression::types::*; |
| 23 | + |
| 24 | +use super::aggregate_scalar_state::ChangeIf; |
| 25 | +use super::FunctionData; |
| 26 | +use super::UnaryState; |
| 27 | + |
| 28 | +#[derive(BorshSerialize, BorshDeserialize)] |
| 29 | +pub struct MinMaxAnyDecimalState<T, C> |
| 30 | +where |
| 31 | + T: ValueType, |
| 32 | + T::Scalar: Decimal, |
| 33 | + <T::Scalar as Decimal>::U64Array: BorshSerialize + BorshDeserialize, |
| 34 | + C: ChangeIf<T>, |
| 35 | +{ |
| 36 | + pub value: Option<<T::Scalar as Decimal>::U64Array>, |
| 37 | + #[borsh(skip)] |
| 38 | + _c: PhantomData<C>, |
| 39 | +} |
| 40 | + |
| 41 | +impl<T, C> Default for MinMaxAnyDecimalState<T, C> |
| 42 | +where |
| 43 | + T: ValueType, |
| 44 | + T::Scalar: Decimal, |
| 45 | + <T::Scalar as Decimal>::U64Array: BorshSerialize + BorshDeserialize, |
| 46 | + C: ChangeIf<T>, |
| 47 | +{ |
| 48 | + fn default() -> Self { |
| 49 | + Self { |
| 50 | + value: None, |
| 51 | + _c: PhantomData, |
| 52 | + } |
| 53 | + } |
| 54 | +} |
| 55 | + |
| 56 | +impl<T, C> UnaryState<T, T> for MinMaxAnyDecimalState<T, C> |
| 57 | +where |
| 58 | + T: ValueType, |
| 59 | + T::Scalar: Decimal, |
| 60 | + <T::Scalar as Decimal>::U64Array: BorshSerialize + BorshDeserialize, |
| 61 | + C: ChangeIf<T> + Default, |
| 62 | +{ |
| 63 | + fn add( |
| 64 | + &mut self, |
| 65 | + other: T::ScalarRef<'_>, |
| 66 | + _function_data: Option<&dyn FunctionData>, |
| 67 | + ) -> Result<()> { |
| 68 | + match self.value { |
| 69 | + Some(v) => { |
| 70 | + let v = T::Scalar::from_u64_array(v); |
| 71 | + if C::change_if(&T::to_scalar_ref(&v), &other) { |
| 72 | + self.value = Some(T::Scalar::to_u64_array(T::to_owned_scalar(other))); |
| 73 | + } |
| 74 | + } |
| 75 | + None => { |
| 76 | + self.value = Some(T::Scalar::to_u64_array(T::to_owned_scalar(other))); |
| 77 | + } |
| 78 | + } |
| 79 | + Ok(()) |
| 80 | + } |
| 81 | + |
| 82 | + fn add_batch( |
| 83 | + &mut self, |
| 84 | + other: T::Column, |
| 85 | + validity: Option<&Bitmap>, |
| 86 | + function_data: Option<&dyn FunctionData>, |
| 87 | + ) -> Result<()> { |
| 88 | + let column_len = T::column_len(&other); |
| 89 | + if column_len == 0 { |
| 90 | + return Ok(()); |
| 91 | + } |
| 92 | + |
| 93 | + let column_iter = T::iter_column(&other); |
| 94 | + match validity { |
| 95 | + Some(validity) |
| 96 | + if validity.unset_bits() > 0 && validity.unset_bits() < validity.len() => |
| 97 | + { |
| 98 | + let v = column_iter |
| 99 | + .zip(validity) |
| 100 | + .filter(|(_, valid)| *valid) |
| 101 | + .map(|(v, _)| v) |
| 102 | + .reduce(|l, r| if !C::change_if(&l, &r) { l } else { r }); |
| 103 | + if let Some(v) = v { |
| 104 | + let _ = self.add(v, function_data); |
| 105 | + } |
| 106 | + } |
| 107 | + Some(validity) if validity.unset_bits() == validity.len() => {} |
| 108 | + _ => { |
| 109 | + let v = column_iter.reduce(|l, r| if !C::change_if(&l, &r) { l } else { r }); |
| 110 | + if let Some(v) = v { |
| 111 | + let _ = self.add(v, function_data); |
| 112 | + } |
| 113 | + } |
| 114 | + } |
| 115 | + |
| 116 | + Ok(()) |
| 117 | + } |
| 118 | + |
| 119 | + fn merge(&mut self, rhs: &Self) -> Result<()> { |
| 120 | + if let Some(v) = rhs.value { |
| 121 | + let v = T::Scalar::from_u64_array(v); |
| 122 | + self.add(T::to_scalar_ref(&v), None)?; |
| 123 | + } |
| 124 | + Ok(()) |
| 125 | + } |
| 126 | + |
| 127 | + fn merge_result( |
| 128 | + &mut self, |
| 129 | + builder: &mut T::ColumnBuilder, |
| 130 | + _function_data: Option<&dyn FunctionData>, |
| 131 | + ) -> Result<()> { |
| 132 | + if let Some(v) = self.value { |
| 133 | + let v = T::Scalar::from_u64_array(v); |
| 134 | + T::push_item(builder, T::to_scalar_ref(&v)); |
| 135 | + } else { |
| 136 | + T::push_default(builder); |
| 137 | + } |
| 138 | + Ok(()) |
| 139 | + } |
| 140 | +} |
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