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read.go
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read.go
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package client
import (
"context"
"database/sql"
"fmt"
"strings"
"github.com/apache/arrow/go/v16/arrow"
"github.com/apache/arrow/go/v16/arrow/array"
"github.com/apache/arrow/go/v16/arrow/memory"
"github.com/cloudquery/plugin-sdk/v4/schema"
)
const (
readSQL = `SELECT %s FROM %s`
)
func (*Client) createResultsArray(table *arrow.Schema) []any {
results := make([]any, 0, len(table.Fields()))
for _, col := range table.Fields() {
switch col.Type.ID() {
case arrow.BOOL:
var r sql.NullBool
results = append(results, &r)
case arrow.BINARY, arrow.LARGE_BINARY:
var r []byte
results = append(results, &r)
case arrow.INT8, arrow.INT16, arrow.INT32, arrow.INT64, arrow.UINT8, arrow.UINT16, arrow.UINT32, arrow.UINT64:
var r sql.NullInt64
results = append(results, &r)
case arrow.FLOAT16, arrow.FLOAT32, arrow.FLOAT64:
var r sql.NullFloat64
results = append(results, &r)
default:
var r sql.NullString
results = append(results, &r)
}
}
return results
}
func reverseTransform(sc *arrow.Schema, values []any) (arrow.Record, error) {
bldr := array.NewRecordBuilder(memory.DefaultAllocator, sc)
for i, val := range values {
switch sc.Field(i).Type.ID() {
case arrow.BOOL:
if val.(*sql.NullBool).Valid {
bldr.Field(i).(*array.BooleanBuilder).Append(val.(*sql.NullBool).Bool)
} else {
bldr.Field(i).(*array.BooleanBuilder).AppendNull()
}
case arrow.INT8:
v := val.(*sql.NullInt64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Int8Builder).Append(int8(v.Int64))
}
case arrow.INT16:
v := val.(*sql.NullInt64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Int16Builder).Append(int16(v.Int64))
}
case arrow.INT32:
v := val.(*sql.NullInt64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Int32Builder).Append(int32(v.Int64))
}
case arrow.INT64:
v := val.(*sql.NullInt64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Int64Builder).Append(v.Int64)
}
case arrow.UINT8:
v := val.(*sql.NullInt64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Uint8Builder).Append(uint8(v.Int64))
}
case arrow.UINT16:
v := val.(*sql.NullInt64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Uint16Builder).Append(uint16(v.Int64))
}
case arrow.UINT32:
v := val.(*sql.NullInt64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Uint32Builder).Append(uint32(v.Int64))
}
case arrow.UINT64:
v := val.(*sql.NullInt64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Uint64Builder).Append(uint64(v.Int64))
}
case arrow.FLOAT32:
v := val.(*sql.NullFloat64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Float32Builder).Append(float32(val.(*sql.NullFloat64).Float64))
}
case arrow.FLOAT64:
v := val.(*sql.NullFloat64)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.Float64Builder).Append(val.(*sql.NullFloat64).Float64)
}
case arrow.STRING:
v := val.(*sql.NullString)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.StringBuilder).Append(val.(*sql.NullString).String)
}
case arrow.BINARY, arrow.LARGE_BINARY:
if *val.(*[]byte) == nil {
bldr.Field(i).AppendNull()
} else {
bldr.Field(i).(*array.BinaryBuilder).Append(*val.(*[]byte))
}
default:
v := val.(*sql.NullString)
if !v.Valid {
bldr.Field(i).AppendNull()
} else {
if err := bldr.Field(i).AppendValueFromString(val.(*sql.NullString).String); err != nil {
return nil, fmt.Errorf("failed to AppendValueFromString %s. field: %v. name: %s err: %w", *val.(*string), bldr.Field(i).Type(), sc.Fields()[i].Name, err)
}
}
}
}
rec := bldr.NewRecord()
return rec, nil
}
func (c *Client) Read(ctx context.Context, table *schema.Table, res chan<- arrow.Record) error {
colNames := make([]string, len(table.Columns))
for i, col := range table.Columns {
colNames[i] = identifier(col.Name)
}
cols := strings.Join(colNames, ", ")
rows, err := c.db.Query(fmt.Sprintf(readSQL, cols, identifier(table.Name)))
if err != nil {
return err
}
arrowSchema := table.ToArrowSchema()
for rows.Next() {
values := c.createResultsArray(arrowSchema)
if err := rows.Scan(values...); err != nil {
return fmt.Errorf("failed to read from table %s: %w", table.Name, err)
}
record, err := reverseTransform(arrowSchema, values)
if err != nil {
return err
}
res <- record
}
rows.Close()
return nil
}