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Optimize FileDescriptorTables memory overhead by shrinking internal sets after initialization. #29540

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Optimize FileDescriptorTables memory overhead by shrinking internal sets after initialization. #29540

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6 changes: 5 additions & 1 deletion src/google/protobuf/descriptor.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1965,7 +1965,11 @@ bool DescriptorPool::Tables::AddFile(const FileDescriptor* file) {
}
}

void FileDescriptorTables::FinalizeTables() {}
void FileDescriptorTables::FinalizeTables() {
symbols_by_parent_.rehash(0);
fields_by_number_.rehash(0);
enum_values_by_number_.rehash(0);
}

bool FileDescriptorTables::AddFieldByNumber(FieldDescriptor* field) {
// Skip fields that are at the start of the sequence.
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