| DataFrame |   | 
| 1 (Type/Class) | DataFrame.Internal.DataFrame, DataFrame | 
| 2 (Data Constructor) | DataFrame.Internal.DataFrame | 
| dataframeDimensions | DataFrame.Internal.DataFrame | 
| DataFrameException | DataFrame.Errors, DataFrame | 
| DataPageHeader | DataFrame.IO.Parquet.Types | 
| dataPageHeaderEncoding | DataFrame.IO.Parquet.Types | 
| dataPageHeaderNumValues | DataFrame.IO.Parquet.Types | 
| dataPageHeaderStatistics | DataFrame.IO.Parquet.Types | 
| DataPageHeaderV2 | DataFrame.IO.Parquet.Types | 
| dataPageHeaderV2Encoding | DataFrame.IO.Parquet.Types | 
| dataPageHeaderV2IsCompressed | DataFrame.IO.Parquet.Types | 
| dataPageHeaderV2NumNulls | DataFrame.IO.Parquet.Types | 
| dataPageHeaderV2NumRows | DataFrame.IO.Parquet.Types | 
| dataPageHeaderV2NumValues | DataFrame.IO.Parquet.Types | 
| dataPageHeaderV2Statistics | DataFrame.IO.Parquet.Types | 
| DATA_PAGE | DataFrame.IO.Parquet.Types | 
| DATA_PAGE_V2 | DataFrame.IO.Parquet.Types | 
| dateFormat | DataFrame.IO.CSV, DataFrame | 
| DATE_TYPE | DataFrame.IO.Parquet.Types | 
| dayToJulianDay | DataFrame.IO.Parquet.Time | 
| DBool | DataFrame.IO.Parquet.Types | 
| DDouble | DataFrame.IO.Parquet.Types | 
| DecimalType | DataFrame.IO.Parquet.Types | 
| decimalTypePrecision | DataFrame.IO.Parquet.Types | 
| decimalTypeScale | DataFrame.IO.Parquet.Types | 
| DECIMAL_TYPE | DataFrame.IO.Parquet.Types | 
| declareColumns | DataFrame.Functions | 
| decodeDictIndicesV1 | DataFrame.IO.Parquet.Encoding | 
| decodeDictV1 | DataFrame.IO.Parquet.Dictionary | 
| decodeRLEBitPackedHybrid | DataFrame.IO.Parquet.Encoding | 
| deduplicate | DataFrame.Functions | 
| defaultBeamConfig | DataFrame.Functions | 
| defaultDisplayOptions | DataFrame.Display, DataFrame | 
| defaultMetadata | DataFrame.IO.Parquet.Thrift | 
| defaultOptions | DataFrame.Lazy.IO.CSV | 
| defaultPlotConfig |   | 
| 1 (Function) | DataFrame.Display.Web.Plot | 
| 2 (Function) | DataFrame.Display.Terminal.Plot, DataFrame | 
| defaultReadOptions | DataFrame.IO.CSV, DataFrame | 
| defaultSchemaElement | DataFrame.IO.Parquet.Thrift | 
| definitionLevelByteLength | DataFrame.IO.Parquet.Types | 
| definitionLevelEncoding | DataFrame.IO.Parquet.Types | 
| definitionLevelHistogram | DataFrame.IO.Parquet.Types | 
| Derive | DataFrame.Lazy.Internal.DataFrame, DataFrame.Lazy | 
| derive |   | 
| 1 (Function) | DataFrame.Operations.Transformations, DataFrame | 
| 2 (Function) | DataFrame.Lazy.Internal.DataFrame, DataFrame.Lazy | 
| Descending | DataFrame.Operations.Sorting, DataFrame | 
| describeColumns | DataFrame.Operations.Core, DataFrame | 
| DFloat | DataFrame.IO.Parquet.Types | 
| dictCardinality | DataFrame.IO.Parquet.Dictionary | 
| DictionaryPageHeader | DataFrame.IO.Parquet.Types | 
| dictionaryPageHeaderEncoding | DataFrame.IO.Parquet.Types | 
| dictionaryPageHeaderNumValues | DataFrame.IO.Parquet.Types | 
| dictionaryPageIsSorted | DataFrame.IO.Parquet.Types | 
| DICTIONARY_PAGE | DataFrame.IO.Parquet.Types | 
| DictVals | DataFrame.IO.Parquet.Types | 
| dimensions | DataFrame.Operations.Core, DataFrame | 
| DInt32 | DataFrame.IO.Parquet.Types | 
| DInt64 | DataFrame.IO.Parquet.Types | 
| DInt96 | DataFrame.IO.Parquet.Types | 
| display | DataFrame.Display, DataFrame | 
| DisplayOptions |   | 
| 1 (Type/Class) | DataFrame.Display, DataFrame | 
| 2 (Data Constructor) | DataFrame.Display, DataFrame | 
| displayRows | DataFrame.Display, DataFrame | 
| distinct | DataFrame.Operations.Aggregation, DataFrame | 
| div | DataFrame.Functions | 
| divide | DataFrame.Internal.Expression | 
| DOUBLE | DataFrame.IO.Parquet.Thrift | 
| DoubleType | DataFrame.IO.CSV | 
| drop | DataFrame.Operations.Subset, DataFrame | 
| dropLast | DataFrame.Operations.Subset, DataFrame | 
| DText | DataFrame.IO.Parquet.Types |