GH-3175: support protobuf library version 4 #3352
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The getSyntax method on messageDescriptor.getFile() got removed in protobuf version 4. This change gets the syntax information directly from the proto, this works in protobuf v3 and v4. fixes apache#3175 see also apache#3182
Fokko
reviewed
Oct 26, 2025
| if ("editions".equals(syntax)) { | ||
| throw new UnsupportedOperationException("protocol buffers 'editions' not supported"); | ||
| } | ||
| boolean isProto2 = !"proto3".equals(syntax); |
Contributor
There was a problem hiding this comment.
Wouldn't it be better to check the versions explicitly, and raise on anything else (for example editions, as above).
Suggested change
| boolean isProto2 = !"proto3".equals(syntax); | |
| boolean isProto2 = "proto2".equals(syntax); |
Author
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I wanted to keep the logic the same as in the protobuf library (v4), they have this code:
Edition getEdition() {
switch (proto.getSyntax()) {
case "editions":
return proto.getEdition();
case "proto3":
return Edition.EDITION_PROTO3;
default:
return Edition.EDITION_PROTO2;
}
}
In my tests the value of syntax was an empty string (not "proto2") for proto2 files, this is why it just compares against "editions" and "proto3".
nandorKollar
approved these changes
Nov 4, 2025
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Rationale for this change
The getSyntax method on messageDescriptor.getFile() got removed in protobuf version 4.
It crashes when a user updates to protobuf 4 and uses the parquet library.
What changes are included in this PR?
This change gets the syntax information directly from the proto, this works in protobuf v3 and v4.
Are these changes tested?
yes, running the existing tests (with protobuf 3).
Are there any user-facing changes?
Closes #3175
Related to #3182