jackjlli opened a new pull request #3711: Fix SegmentConverter to handle virtual column URL: https://github.com/apache/incubator-pinot/pull/3711 Currently the `ConvertPinotSegment` command didn't work properly with virtual column. This PR fixes this issue by removing virtual columns before writing to avro file. Error messages we found: ``` $ ./pinot-distribution/target/pinot-0.016-pkg/bin/pinot-admin.sh ConvertPinotSegment -dataDir /input/test -outputDir /output/test -outputFormat avro -overwrite Exception caught: org.apache.avro.SchemaParseException: Illegal initial character: $hostName at org.apache.avro.Schema.validateName(Schema.java:1064) at org.apache.avro.Schema.access$200(Schema.java:79) at org.apache.avro.Schema$Field.<init>(Schema.java:372) at org.apache.avro.SchemaBuilder$FieldBuilder.completeField(SchemaBuilder.java:2124) at org.apache.avro.SchemaBuilder$FieldBuilder.completeField(SchemaBuilder.java:2120) at org.apache.avro.SchemaBuilder$FieldBuilder.access$5200(SchemaBuilder.java:2034) at org.apache.avro.SchemaBuilder$FieldDefault.noDefault(SchemaBuilder.java:2146) at org.apache.pinot.core.util.AvroUtils.getAvroSchemaFromPinotSchema(AvroUtils.java:165) at org.apache.pinot.tools.segment.converter.PinotSegmentToAvroConverter.convert(PinotSegmentToAvroConverter.java:47) at org.apache.pinot.tools.segment.converter.PinotSegmentConvertCommand.execute(PinotSegmentConvertCommand.java:133) at org.apache.pinot.tools.admin.PinotAdministrator.execute(PinotAdministrator.java:126) at org.apache.pinot.tools.admin.PinotAdministrator.main(PinotAdministrator.java:138) ```
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