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From "Lars Volker (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-4177,IMPALA-6039: batched bit reading and rle decoding
Date Mon, 23 Oct 2017 21:12:27 GMT
Lars Volker has posted comments on this change. ( )

Change subject: IMPALA-4177,IMPALA-6039: batched bit reading and rle decoding

Patch Set 11:


One more questions, looks good to me otherwise.
File be/src/util/bit-packing.inline.h:
PS8, Line 56:   switch (bit_width) {
> I restructured it a bit more to separate out the macro definition from the 
Much better, thx.
File be/src/util/
PS8, Line 193: // Make sure that SetData() resets the dictionary decoder, including the embedded
> I originally added it because I had a bug here that was somewhat tricky to 
Thank you for clarifying this.
File be/src/util/
PS11, Line 234:   // Generate a dictionary with 9 values (requires 3 bits to encode).
I don't understand how 3 bits can encode 9 different values. Should these be 8 values instead?
File be/src/util/
PS8, Line 120: num_vals,
> I don't feel strongly either way and I'm probably not that consistent. I've
Sounds good.

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I35de0cf80c86f501c4a39270afc8fb8111552ac6
Gerrit-Change-Number: 8267
Gerrit-PatchSet: 11
Gerrit-Owner: Tim Armstrong <>
Gerrit-Reviewer: Lars Volker <>
Gerrit-Reviewer: Tim Armstrong <>
Gerrit-Comment-Date: Mon, 23 Oct 2017 21:12:27 +0000
Gerrit-HasComments: Yes

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