private Schema.Field createAvroField(String name, TypeInfo typeInfo, String comment) {
    return new Schema.Field(name, createAvroSchema(typeInfo), comment, JsonProperties.NULL_VALUE);
  }
Converts Hive schema to avro schema

@param columnNames Names of the hive columns
@param columnTypes Hive Column types
@param namespace   Namespace of Avro schema
@param name        Avro schema name
@param doc         Avro schema doc
@return Avro Schema
serde/src/java/org/apache/hadoop/hive/serde2/avro/TypeInfoToSchema.java