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transformer.go
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60 lines (57 loc) · 1.47 KB
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package client
import (
"github.com/apache/arrow-go/v18/arrow"
"github.com/apache/arrow-go/v18/arrow/array"
)
func getValue(arr arrow.Array, i int) any {
if !arr.IsValid(i) {
return nil
}
switch arr.DataType().ID() {
case arrow.BOOL:
return arr.(*array.Boolean).Value(i)
case arrow.INT8:
return arr.(*array.Int8).Value(i)
case arrow.INT16:
return arr.(*array.Int16).Value(i)
case arrow.INT32:
return arr.(*array.Int32).Value(i)
case arrow.INT64:
return arr.(*array.Int64).Value(i)
case arrow.UINT8:
return arr.(*array.Uint8).Value(i)
case arrow.UINT16:
return arr.(*array.Uint16).Value(i)
case arrow.UINT32:
return arr.(*array.Uint32).Value(i)
case arrow.UINT64:
// SQLite fails if uint64 overflows int64
return int64(arr.(*array.Uint64).Value(i))
case arrow.FLOAT32:
return arr.(*array.Float32).Value(i)
case arrow.FLOAT64:
return arr.(*array.Float64).Value(i)
case arrow.STRING:
return arr.(*array.String).Value(i)
case arrow.BINARY:
return arr.(*array.Binary).Value(i)
case arrow.LARGE_BINARY:
return arr.(*array.LargeBinary).Value(i)
case arrow.FIXED_SIZE_BINARY:
return arr.(*array.FixedSizeBinary).Value(i)
default:
return arr.ValueStr(i)
}
}
func transformRecord(record arrow.RecordBatch) [][]any {
var res [][]any
for i := int64(0); i < record.NumRows(); i++ {
var row []any
for j := 0; int64(j) < record.NumCols(); j++ {
v := getValue(record.Column(j), int(i))
row = append(row, v)
}
res = append(res, row)
}
return res
}