Examples with DictionaryPage com.facebook.presto.parquet.DictionaryPage used on opensource projects

Example 11 with DictionaryPage

use of com.facebook.presto.parquet.DictionaryPage in project presto by prestodb.

the class AbstractColumnReader method init.

@Override
public void init(PageReader pageReader, Field field, RowRanges rowRanges) {
    this.pageReader = requireNonNull(pageReader, "pageReader is null");
    this.field = requireNonNull(field, "field is null");
    DictionaryPage dictionaryPage = pageReader.readDictionaryPage();
    if (dictionaryPage != null) {
        try {
            dictionary = dictionaryPage.getEncoding().initDictionary(columnDescriptor, dictionaryPage);
        } catch (IOException e) {
            throw new ParquetDecodingException("could not decode the dictionary for " + columnDescriptor, e);
        }
    } else {
        dictionary = null;
    }
    checkArgument(pageReader.getTotalValueCount() > 0, "page is empty");
    totalValueCount = pageReader.getTotalValueCount();
    indexIterator = (rowRanges == null) ? null : rowRanges.iterator();
}