question: public static StructType convertFrameSchemaToDFSchema ( ValueType [ ] fschema , boolean containsID ) { List < StructField > fields = new ArrayList < StructField > ( ) ; if ( containsID ) fields . add ( DataTypes . createStructField ( RDDConverterUtils . DF_ID_COLUMN , DataTypes . DoubleType , true ) ) ; int col = 1 ; for ( ValueType schema : fschema ) { DataType dt = null ; switch ( schema ) { case STRING : dt = DataTypes . StringType ; break ; case DOUBLE : dt = DataTypes . DoubleType ; break ; case INT : dt = DataTypes . LongType ; break ; case BOOLEAN : dt = DataTypes . BooleanType ; break ; default : dt = DataTypes . StringType ; LOG . warn ( "Using default type String for " + schema . toString ( ) ) ; } fields . add ( DataTypes . createStructField ( "C" + col ++ , dt , true ) ) ; } return DataTypes . createStructType ( fields ) ; }
target:  This function will convert Frame schema into DataFrame schema 