byte type = fSchema.type;
switch(type){
case DataType.CHARARRAY:
case DataType.BIGCHARARRAY:
return new HCatFieldSchema(fSchema.alias, Type.STRING, null);
case DataType.INTEGER:
return new HCatFieldSchema(fSchema.alias, Type.INT, null);
case DataType.LONG:
return new HCatFieldSchema(fSchema.alias, Type.BIGINT, null);
case DataType.FLOAT:
return new HCatFieldSchema(fSchema.alias, Type.FLOAT, null);
case DataType.DOUBLE:
return new HCatFieldSchema(fSchema.alias, Type.DOUBLE, null);
case DataType.BYTEARRAY:
return new HCatFieldSchema(fSchema.alias, Type.BINARY, null);
case DataType.BAG:
Schema bagSchema = fSchema.schema;
List<HCatFieldSchema> arrFields = new ArrayList<HCatFieldSchema>(1);
FieldSchema field;
// Find out if we need to throw away the tuple or not.
if (removeTupleFromBag(hcatFieldSchema, fSchema)) {
field = bagSchema.getField(0).schema.getField(0);
} else {
field = bagSchema.getField(0);
}
arrFields.add(getHCatFSFromPigFS(field, hcatFieldSchema == null ? null : hcatFieldSchema.getArrayElementSchema().get(0)));
return new HCatFieldSchema(fSchema.alias, Type.ARRAY, new HCatSchema(arrFields), "");
case DataType.TUPLE:
List<String> fieldNames = new ArrayList<String>();
List<HCatFieldSchema> hcatFSs = new ArrayList<HCatFieldSchema>();
HCatSchema structSubSchema = hcatFieldSchema == null ? null : hcatFieldSchema.getStructSubSchema();
List<FieldSchema> fields = fSchema.schema.getFields();
for (int i = 0; i < fields.size(); i++) {
FieldSchema fieldSchema = fields.get(i);
fieldNames.add(fieldSchema.alias);
hcatFSs.add(getHCatFSFromPigFS(fieldSchema, structSubSchema == null ? null : structSubSchema.get(i)));
}
return new HCatFieldSchema(fSchema.alias, Type.STRUCT, new HCatSchema(hcatFSs), "");
case DataType.MAP:{
// Pig's schema contain no type information about map's keys and
// values. So, if its a new column assume <string,string> if its existing
// return whatever is contained in the existing column.
HCatFieldSchema valFS;
List<HCatFieldSchema> valFSList = new ArrayList<HCatFieldSchema>(1);
if(hcatFieldSchema != null){
return new HCatFieldSchema(fSchema.alias, Type.MAP, Type.STRING, hcatFieldSchema.getMapValueSchema(), "");
}
// Column not found in target table. Its a new column. Its schema is map<string,string>
valFS = new HCatFieldSchema(fSchema.alias, Type.STRING, "");
valFSList.add(valFS);
return new HCatFieldSchema(fSchema.alias,Type.MAP,Type.STRING, new HCatSchema(valFSList),"");
}
default:
throw new FrontendException("Unsupported type: "+type+" in Pig's schema", PigHCatUtil.PIG_EXCEPTION_CODE);
}