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The avro-to-projection cache was keyed on projections.data() only. All empty-struct projections share the same (null) data(), so a second empty struct with more Avro fields reused a cached vector sized for the first and read out of bounds. Include the Avro node in the key and reject out-of-range projected field indexes.
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shangxinli
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Summary
DecodeStructToBuildercached the Avro-field-index to projection-index mapping keyed onprojections.data()only. All empty-struct projections share the same (null)data(), so a second empty struct with more Avro fields reused a cached vector sized for the first one and read out of bounds, which could end in a wild-pointer dispatch viaStructBuilder::field_builder.{projections.data(), avro_node}. The mapping is built and validated before being cached, and a projected field index outside the Avro record's field count returnsInvalidArgument.Test plan
AvroReaderTest.ProjectEmptyStructsOfDifferentWidths: file with two struct columns of 1 and 6 fields, both read back as empty structs through the direct decoderavro_testsuite passes (196 tests)