zeroshade commented on code in PR #485:
URL: https://github.com/apache/arrow-go/pull/485#discussion_r2310521370
##########
parquet/file/column_reader.go:
##########
@@ -437,16 +446,27 @@ func (c *columnChunkReader) initDataDecoder(page Page,
lvlByteLen int64) error {
format.Encoding_DELTA_LENGTH_BYTE_ARRAY,
format.Encoding_DELTA_BINARY_PACKED,
format.Encoding_BYTE_STREAM_SPLIT:
- c.curDecoder =
c.decoderTraits.Decoder(parquet.Encoding(encoding), c.descr, false, c.mem)
- c.decoders[encoding] = c.curDecoder
+ c.curDecoder =
c.decoderTraits.Decoder(parquet.Encoding(enc), c.descr, false, c.mem)
+ c.decoders[enc] = c.curDecoder
case format.Encoding_RLE_DICTIONARY:
return errors.New("parquet: dictionary page must be
before data page")
default:
- return fmt.Errorf("parquet: unknown encoding type %s",
encoding)
+ return fmt.Errorf("parquet: unknown encoding type %s",
enc)
+ }
+ }
+
+ switch c.descr.PhysicalType() {
+ case parquet.Types.FixedLenByteArray:
+ c.curDecoder = &encoding.FixedLenByteArrayDecoderWrapper{
+ FixedLenByteArrayDecoder:
c.curDecoder.(encoding.FixedLenByteArrayDecoder),
+ }
+ case parquet.Types.ByteArray:
+ c.curDecoder = &encoding.ByteArrayDecoderWrapper{
+ ByteArrayDecoder:
c.curDecoder.(encoding.ByteArrayDecoder),
Review Comment:
I think that's also part of why we were creating new buffers and copying the
data rather than being able to reuse the buffers in the page reader (the thing
you're changing in this PR)
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