Kevin Innerebner created SYSTEMML-2565: ------------------------------------------
Summary: FrameBlock read and write Key: SYSTEMML-2565 URL: https://issues.apache.org/jira/browse/SYSTEMML-2565 Project: SystemDS Issue Type: Bug Reporter: Kevin Innerebner FrameBlocks fail (null pointer access) to be serialized in cases where their _coldata is null. This is reproducable: {code:java} // ... code FrameBlock fb = new FrameBlock(data.getNumColumns(), Types.ValueType.STRING); fb.write(do); {code} Note that this is an internal error, so I am not sure if this can happen while executing a dml script. By calling FrameBlock.ensureAllocatedColumns(rows) before writing this can be stopped from happening and I am not aware of instances where this lead to problems at the moment. {code:java} // ... code //write columns (value type, data) for( int j=0; j<getNumColumns(); j++ ) { out.writeByte(_schema[j].ordinal()); if( !isDefaultMeta ) { out.writeUTF(getColumnName(j)); out.writeLong(_colmeta[j].getNumDistinct()); out.writeUTF( (_colmeta[j].getMvValue()!=null) ? _colmeta[j].getMvValue() : "" ); } _coldata[j].write(out); } {code} The problem is the line: {code:java} _coldata[j].write(out); {code} Although we have columns _coldata is still null. -- This message was sent by Atlassian Jira (v8.3.4#803005)