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143 changes: 143 additions & 0 deletions
143
common/functions/src/scalars/semi_structureds/array_get.rs
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|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| // Copyright 2022 Datafuse Labs. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use std::fmt; | ||
|
|
||
| use common_datavalues::prelude::*; | ||
| use common_datavalues::with_match_integer_types_error; | ||
| use common_datavalues::with_match_scalar_types_error; | ||
| use common_exception::ErrorCode; | ||
| use common_exception::Result; | ||
|
|
||
| use crate::scalars::Function; | ||
| use crate::scalars::FunctionContext; | ||
| use crate::scalars::FunctionDescription; | ||
| use crate::scalars::FunctionFeatures; | ||
|
|
||
| #[derive(Clone)] | ||
| pub struct ArrayGetFunction { | ||
| array_type: ArrayType, | ||
| display_name: String, | ||
| } | ||
|
|
||
| impl ArrayGetFunction { | ||
| pub fn try_create(display_name: &str, args: &[&DataTypeImpl]) -> Result<Box<dyn Function>> { | ||
| let data_type = args[0]; | ||
| let path_type = args[1]; | ||
|
|
||
| if !data_type.data_type_id().is_array() || !path_type.data_type_id().is_integer() { | ||
| return Err(ErrorCode::IllegalDataType(format!( | ||
| "Invalid argument types for function '{}': ({:?}, {:?})", | ||
| display_name.to_uppercase(), | ||
| data_type.data_type_id(), | ||
| path_type.data_type_id() | ||
| ))); | ||
| } | ||
|
|
||
| let array_type: ArrayType = data_type.clone().try_into()?; | ||
| Ok(Box::new(ArrayGetFunction { | ||
| array_type, | ||
| display_name: display_name.to_string(), | ||
| })) | ||
| } | ||
|
|
||
| pub fn desc() -> FunctionDescription { | ||
| FunctionDescription::creator(Box::new(Self::try_create)) | ||
| .features(FunctionFeatures::default().deterministic().num_arguments(2)) | ||
| } | ||
| } | ||
|
|
||
| impl Function for ArrayGetFunction { | ||
| fn name(&self) -> &str { | ||
| &*self.display_name | ||
| } | ||
|
|
||
| fn return_type(&self) -> DataTypeImpl { | ||
| NullableType::new_impl(self.array_type.inner_type().clone()) | ||
| } | ||
|
|
||
| fn eval( | ||
| &self, | ||
| _func_ctx: FunctionContext, | ||
| columns: &ColumnsWithField, | ||
| input_rows: usize, | ||
| ) -> Result<ColumnRef> { | ||
| let array_column: &ArrayColumn = if columns[0].column().is_const() { | ||
| let const_column: &ConstColumn = Series::check_get(columns[0].column())?; | ||
| Series::check_get(const_column.inner())? | ||
| } else { | ||
| Series::check_get(columns[0].column())? | ||
| }; | ||
|
|
||
| let inner_type = self.array_type.inner_type().data_type_id(); | ||
| let index_type = columns[1].data_type().data_type_id(); | ||
| with_match_scalar_types_error!(inner_type.to_physical_type(), |$T1| { | ||
| with_match_integer_types_error!(index_type, |$T2| { | ||
| let inner_column: &<$T1 as Scalar>::ColumnType = Series::check_get(array_column.values())?; | ||
| let mut builder = NullableColumnBuilder::<$T1>::with_capacity(input_rows); | ||
| if columns[0].column().is_const() { | ||
| let index_column: &PrimitiveColumn<$T2> = if columns[1].column().is_const() { | ||
| let const_column: &ConstColumn = Series::check_get(columns[1].column())?; | ||
| Series::check_get(const_column.inner())? | ||
| } else { | ||
| Series::check_get(columns[1].column())? | ||
| }; | ||
| let len = array_column.size_at_index(0); | ||
| for (i, index) in index_column.iter().enumerate() { | ||
| let index = usize::try_from(*index)?; | ||
| let _ = check_index(index, len)?; | ||
| builder.append(inner_column.get_data(index), true); | ||
| } | ||
| } else if columns[1].column().is_const() { | ||
| let index_column: &ConstColumn = Series::check_get(columns[1].column())?; | ||
| let index = index_column.get(0).as_u64()? as usize; | ||
| let mut offset = 0; | ||
| for i in 0..input_rows { | ||
| let len = array_column.size_at_index(i); | ||
| let _ = check_index(index, len)?; | ||
| builder.append(inner_column.get_data(offset + index), true); | ||
| offset += len; | ||
| } | ||
| } else { | ||
| let index_column: &PrimitiveColumn<$T2> = Series::check_get(columns[1].column())?; | ||
| let mut offset = 0; | ||
| for (i, index) in index_column.iter().enumerate() { | ||
| let index = usize::try_from(*index)?; | ||
| let len = array_column.size_at_index(i); | ||
| let _ = check_index(index, len)?; | ||
| builder.append(inner_column.get_data(offset + index), true); | ||
| offset += len; | ||
| } | ||
| } | ||
| Ok(builder.build(input_rows)) | ||
| }) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| impl fmt::Display for ArrayGetFunction { | ||
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | ||
| write!(f, "{}", self.display_name.to_uppercase()) | ||
| } | ||
| } | ||
|
|
||
| fn check_index(index: usize, len: usize) -> Result<()> { | ||
| if index >= len { | ||
| return Err(ErrorCode::BadArguments(format!( | ||
| "Index out of array column bounds: the len is {} but the index is {}", | ||
| len, index | ||
| ))); | ||
| } | ||
| Ok(()) | ||
| } |
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