Github user wgtmac commented on a diff in the pull request: https://github.com/apache/orc/pull/245#discussion_r181966485 --- Diff: site/_docs/encodings.md --- @@ -109,10 +109,20 @@ DIRECT_V2 | PRESENT | Yes | Boolean RLE Decimal was introduced in Hive 0.11 with infinite precision (the total number of digits). In Hive 0.13, the definition was change to limit the precision to a maximum of 38 digits, which conveniently uses 127 -bits plus a sign bit. The current encoding of decimal columns stores -the integer representation of the value as an unbounded length zigzag -encoded base 128 varint. The scale is stored in the SECONDARY stream -as an signed integer. +bits plus a sign bit. + +DIRECT and DIRECT_V2 encodings of decimal columns stores the integer +representation of the value as an unbounded length zigzag encoded base +128 varint. The scale is stored in the SECONDARY stream as an signed +integer. + +In ORC 2.0, DECIMAL_V1 and DECIMAL_V2 encodins are introduced and --- End diff -- We may also add dictionary encodings for integer and floating types. I think we can still use DICTIONARY_Vx and it has unique meaning for different data types.