Github user arina-ielchiieva commented on a diff in the pull request:
    --- Diff: 
    @@ -222,15 +222,17 @@ public DrillTable isReadable(DrillFileSystem fs, 
FileSelection selection,
               // create a metadata context that will be used for the duration 
of the query for this table
               MetadataContext metaContext = new MetadataContext();
    -          ParquetTableMetadataDirs mDirs = Metadata.readMetadataDirs(fs, 
dirMetaPath.toString(), metaContext, formatConfig);
    -          if (mDirs.getDirectories().size() > 0) {
    -            FileSelection dirSelection = 
FileSelection.createFromDirectories(mDirs.getDirectories(), selection,
    -                selection.getSelectionRoot() /* cacheFileRoot initially 
points to selectionRoot */);
    -            dirSelection.setExpandedPartial();
    -            dirSelection.setMetaContext(metaContext);
    -            return new DynamicDrillTable(fsPlugin, storageEngineName, 
    -                new FormatSelection(plugin.getConfig(), dirSelection));
    +          ParquetTableMetadataDirs mDirs = Metadata.readMetadataDirs(fs, 
dirMetaPath, metaContext, formatConfig);
    +          if (mDirs != null) {
    +            if (mDirs.getDirectories().size() > 0) {
    --- End diff --
    Can we combine two `if` statements into one?

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