| #------------------------------------------------------------- |
| # |
| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| # |
| #------------------------------------------------------------- |
| |
| # Reader side of the native Delta frame round-trip test. Reads the Delta table |
| # as a frame (schema + dimensions discovered from the transaction log) and the |
| # text matrix reference, both genuine HDFS reads in a fresh process, then |
| # reports the elementwise reconstruction error and the discovered dimensions. |
| |
| Y = read($1, data_type="frame", format="delta") |
| Xref = read($2, format="text") |
| |
| M = as.matrix(Y) |
| R = matrix(0, rows=1, cols=3) |
| R[1,1] = sum(abs(Xref - M)) # 0 if FrameReaderDelta reconstructed the frame exactly |
| R[1,2] = nrow(Y) # discovered row count |
| R[1,3] = ncol(Y) # discovered column count |
| write(R, $3) |
