Spanner - Improve methods from some of the builder patterns for generic usages #1805

        Mutation.WriteBuilder writeBuilder = Mutation.newInsertOrUpdateBuilder( key.getTable() );
		tuplePointer.getTuple().getOperations().forEach( op -> {
			switch ( op.getType() ) {
				case PUT:
					ValueBinder<Mutation.WriteBuilder> set = writeBuilder.set( op.getColumn() );
					Object object = op.getValue();
					//TODO should we convert to Google Spanner native types here or before?
					// e.g. they have their own Date and Timestamp
					if ( object instanceof Timestamp ) {
						set.to( (Timestamp) object );
					}
					else if ( object instanceof Date ) {
						set.to( (Date) object );
					}
					else if ( object instanceof String ) {
						set.to( (String) object );
					}
					else if ( object instanceof Long ) {
						set.to( (Long) object );
					}
					else if ( object instanceof Boolean ) {
						set.to( (Boolean) object );
					}
					else if ( object instanceof Double ) {
						set.to( (Double) object );
					}
					break;
				case PUT_NULL:
				case REMOVE:
					// TODO add metadata related to the type of the column we nullify
					writeBuilder.set( op.getColumn() ).to( (String) null);
                                        break;
			}

		} );
		databaseClient.write( Arrays.asList( writeBuilder.build() ) );

// ideally if types is optional that's even better
setAll(String[] columnNames, Object[] columnValues, Class[] types);