apache pig & piggybank avro union types -


i have record of union type of

union {typea, typeb, typec, typed, typee} mydata;

i have serialized data in avro format, when trying use piggybank.jar's avrostorage function load avro data, gives me following error:

caused by: java.io.ioexception: don't accept schema containing generic unions.     @ org.apache.pig.piggybank.storage.avro.avroschema2pig.convert(avroschema2pig.java:54)     @ org.apache.pig.piggybank.storage.avro.avrostorage.getschema(avrostorage.java:384)     @ org.apache.pig.newplan.logical.relational.loload.getschemafrommetadata(loload.java:174)     ... 23 more

so, after reading piggybank source code here https://github.com/triplel/pig/blob/branch-0.12/contrib/piggybank/java/src/main/java/org/apache/pig/piggybank/storage/avro/avrostorageutils.java

    /** determine whether union nullable union;     * note function doesn't check containing     * types of input union recursively. */     public static boolean isacceptableunion(schema in) {         if (! in.gettype().equals(schema.type.union))            return false;      list<schema> types = in.gettypes();     if (types.size() <= 1) {         return true;     } else if (types.size() > 2) {         return false; /*contains more 2 types */     } else {         /* 1 of 2 types null */         return types.get(0).gettype().equals(schema.type.null) || types.get(1) .gettype().equals(schema.type.null);     } }

basically piggybank's avrostorage not support more 2 union types, wondering idea behind decision? why not make compatible avro?


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