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array.go
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/
array.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.
package array
import (
"sync/atomic"
"github.com/apache/arrow/go/v12/arrow"
"github.com/apache/arrow/go/v12/arrow/bitutil"
"github.com/apache/arrow/go/v12/arrow/internal/debug"
)
const (
// UnknownNullCount specifies the NullN should be calculated from the null bitmap buffer.
UnknownNullCount = -1
)
type array struct {
refCount int64
data *Data
nullBitmapBytes []byte
}
// Retain increases the reference count by 1.
// Retain may be called simultaneously from multiple goroutines.
func (a *array) Retain() {
atomic.AddInt64(&a.refCount, 1)
}
// Release decreases the reference count by 1.
// Release may be called simultaneously from multiple goroutines.
// When the reference count goes to zero, the memory is freed.
func (a *array) Release() {
debug.Assert(atomic.LoadInt64(&a.refCount) > 0, "too many releases")
if atomic.AddInt64(&a.refCount, -1) == 0 {
a.data.Release()
a.data, a.nullBitmapBytes = nil, nil
}
}
// DataType returns the type metadata for this instance.
func (a *array) DataType() arrow.DataType { return a.data.dtype }
// NullN returns the number of null values in the array.
func (a *array) NullN() int {
if a.data.nulls < 0 {
a.data.nulls = a.data.length - bitutil.CountSetBits(a.nullBitmapBytes, a.data.offset, a.data.length)
}
return a.data.nulls
}
// NullBitmapBytes returns a byte slice of the validity bitmap.
func (a *array) NullBitmapBytes() []byte { return a.nullBitmapBytes }
func (a *array) Data() arrow.ArrayData { return a.data }
// Len returns the number of elements in the array.
func (a *array) Len() int { return a.data.length }
// IsNull returns true if value at index is null.
// NOTE: IsNull will panic if NullBitmapBytes is not empty and 0 > i ≥ Len.
func (a *array) IsNull(i int) bool {
return len(a.nullBitmapBytes) != 0 && bitutil.BitIsNotSet(a.nullBitmapBytes, a.data.offset+i)
}
// IsValid returns true if value at index is not null.
// NOTE: IsValid will panic if NullBitmapBytes is not empty and 0 > i ≥ Len.
func (a *array) IsValid(i int) bool {
return len(a.nullBitmapBytes) == 0 || bitutil.BitIsSet(a.nullBitmapBytes, a.data.offset+i)
}
func (a *array) setData(data *Data) {
// Retain before releasing in case a.data is the same as data.
data.Retain()
if a.data != nil {
a.data.Release()
}
if len(data.buffers) > 0 && data.buffers[0] != nil {
a.nullBitmapBytes = data.buffers[0].Bytes()
}
a.data = data
}
func (a *array) Offset() int {
return a.data.Offset()
}
type arrayConstructorFn func(arrow.ArrayData) arrow.Array
var (
makeArrayFn [64]arrayConstructorFn
)
func invalidDataType(data arrow.ArrayData) arrow.Array {
panic("invalid data type: " + data.DataType().ID().String())
}
// MakeFromData constructs a strongly-typed array instance from generic Data.
func MakeFromData(data arrow.ArrayData) arrow.Array {
return makeArrayFn[byte(data.DataType().ID()&0x3f)](data)
}
// NewSlice constructs a zero-copy slice of the array with the indicated
// indices i and j, corresponding to array[i:j].
// The returned array must be Release()'d after use.
//
// NewSlice panics if the slice is outside the valid range of the input array.
// NewSlice panics if j < i.
func NewSlice(arr arrow.Array, i, j int64) arrow.Array {
data := NewSliceData(arr.Data(), i, j)
slice := MakeFromData(data)
data.Release()
return slice
}
func init() {
makeArrayFn = [...]arrayConstructorFn{
arrow.NULL: func(data arrow.ArrayData) arrow.Array { return NewNullData(data) },
arrow.BOOL: func(data arrow.ArrayData) arrow.Array { return NewBooleanData(data) },
arrow.UINT8: func(data arrow.ArrayData) arrow.Array { return NewUint8Data(data) },
arrow.INT8: func(data arrow.ArrayData) arrow.Array { return NewInt8Data(data) },
arrow.UINT16: func(data arrow.ArrayData) arrow.Array { return NewUint16Data(data) },
arrow.INT16: func(data arrow.ArrayData) arrow.Array { return NewInt16Data(data) },
arrow.UINT32: func(data arrow.ArrayData) arrow.Array { return NewUint32Data(data) },
arrow.INT32: func(data arrow.ArrayData) arrow.Array { return NewInt32Data(data) },
arrow.UINT64: func(data arrow.ArrayData) arrow.Array { return NewUint64Data(data) },
arrow.INT64: func(data arrow.ArrayData) arrow.Array { return NewInt64Data(data) },
arrow.FLOAT16: func(data arrow.ArrayData) arrow.Array { return NewFloat16Data(data) },
arrow.FLOAT32: func(data arrow.ArrayData) arrow.Array { return NewFloat32Data(data) },
arrow.FLOAT64: func(data arrow.ArrayData) arrow.Array { return NewFloat64Data(data) },
arrow.STRING: func(data arrow.ArrayData) arrow.Array { return NewStringData(data) },
arrow.BINARY: func(data arrow.ArrayData) arrow.Array { return NewBinaryData(data) },
arrow.FIXED_SIZE_BINARY: func(data arrow.ArrayData) arrow.Array { return NewFixedSizeBinaryData(data) },
arrow.DATE32: func(data arrow.ArrayData) arrow.Array { return NewDate32Data(data) },
arrow.DATE64: func(data arrow.ArrayData) arrow.Array { return NewDate64Data(data) },
arrow.TIMESTAMP: func(data arrow.ArrayData) arrow.Array { return NewTimestampData(data) },
arrow.TIME32: func(data arrow.ArrayData) arrow.Array { return NewTime32Data(data) },
arrow.TIME64: func(data arrow.ArrayData) arrow.Array { return NewTime64Data(data) },
arrow.INTERVAL_MONTHS: func(data arrow.ArrayData) arrow.Array { return NewMonthIntervalData(data) },
arrow.INTERVAL_DAY_TIME: func(data arrow.ArrayData) arrow.Array { return NewDayTimeIntervalData(data) },
arrow.DECIMAL128: func(data arrow.ArrayData) arrow.Array { return NewDecimal128Data(data) },
arrow.DECIMAL256: func(data arrow.ArrayData) arrow.Array { return NewDecimal256Data(data) },
arrow.LIST: func(data arrow.ArrayData) arrow.Array { return NewListData(data) },
arrow.STRUCT: func(data arrow.ArrayData) arrow.Array { return NewStructData(data) },
arrow.SPARSE_UNION: func(data arrow.ArrayData) arrow.Array { return NewSparseUnionData(data) },
arrow.DENSE_UNION: func(data arrow.ArrayData) arrow.Array { return NewDenseUnionData(data) },
arrow.DICTIONARY: func(data arrow.ArrayData) arrow.Array { return NewDictionaryData(data) },
arrow.MAP: func(data arrow.ArrayData) arrow.Array { return NewMapData(data) },
arrow.EXTENSION: func(data arrow.ArrayData) arrow.Array { return NewExtensionData(data) },
arrow.FIXED_SIZE_LIST: func(data arrow.ArrayData) arrow.Array { return NewFixedSizeListData(data) },
arrow.DURATION: func(data arrow.ArrayData) arrow.Array { return NewDurationData(data) },
arrow.LARGE_STRING: func(data arrow.ArrayData) arrow.Array { return NewLargeStringData(data) },
arrow.LARGE_BINARY: func(data arrow.ArrayData) arrow.Array { return NewLargeBinaryData(data) },
arrow.LARGE_LIST: func(data arrow.ArrayData) arrow.Array { return NewLargeListData(data) },
arrow.INTERVAL_MONTH_DAY_NANO: func(data arrow.ArrayData) arrow.Array { return NewMonthDayNanoIntervalData(data) },
arrow.RUN_END_ENCODED: func(data arrow.ArrayData) arrow.Array { return NewRunEndEncodedData(data) },
// invalid data types to fill out array to size 2^6 - 1
63: invalidDataType,
}
}