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From: abhipol <git@git.apache.org>
To: dev@drill.apache.org
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References: <git-pr-232-drill@git.apache.org>
In-Reply-To: <git-pr-232-drill@git.apache.org>
Subject: [GitHub] drill pull request: DRILL-951:CSV header row should be
 parsed
Content-Type: text/plain
Message-Id: <20151103072119.1359EE03CE@git1-us-west.apache.org>
Date: Tue,  3 Nov 2015 07:21:19 +0000 (UTC)

Github user abhipol commented on a diff in the pull request:

    https://github.com/apache/drill/pull/232#discussion_r43721297
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/easy/text/compliant/CompliantTextRecordReader.java ---
    @@ -101,16 +108,23 @@ public void setup(OperatorContext context, OutputMutator outputMutator) throws E
           InputStream stream = dfs.openPossiblyCompressedStream(split.getPath());
           TextInput input = new TextInput(settings,  stream, readBuffer, split.getStart(), split.getStart() + split.getLength());
     
    -      TextOutput output = null;
           if(settings.isUseRepeatedVarChar()){
    -        output = new RepeatedVarCharOutput(outputMutator, getColumns(), isStarQuery());
    -      }else{
    -        //TODO: Add field output.
    -        throw new UnsupportedOperationException();
    +        TextOutput output = new RepeatedVarCharOutput(outputMutator, getColumns(), isStarQuery());
    +        this.reader = new TextReader(settings, input, output, whitespaceBuffer);
    +        reader.start();
    +      } else {
    +        // two-phase read approach.
    +        // phase-1: read the header from the file
    +        String [] fieldNames = extractHeader(input);
    +
    +        // phase-2: now read the data
    +        stream = dfs.openPossiblyCompressedStream(split.getPath());
    +        input = new TextInput(settings,  stream, readBuffer, split.getStart(), split.getStart() + split.getLength());
    +        TextOutput output = new FieldVarCharOutput(outputMutator, fieldNames, getColumns(), isStarQuery());
    +        this.reader = new TextReader(settings, input, output, whitespaceBuffer);
    --- End diff --
    
    the second output is using FieldVarCharOutput
    I made few cosmetic changes for better flow. will upload with other changes.


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