Man pages for vectra
Columnar Query Engine for Larger-than-RAM Data
| across | Apply a function across multiple columns |
| append_vtr | Append rows to an existing .vtr file |
| arrange | Sort rows by column values |
| bind_rows | Bind rows or columns from multiple vectra tables |
| block_fuzzy_lookup | Fuzzy-match query keys against a materialized block |
| block_lookup | Probe a materialized block by column value |
| collect | Execute a lazy query and return a data.frame |
| count | Count observations by group |
| create_index | Create a hash index on a .vtr file column |
| cross_join | Cross join two vectra tables |
| delete_vtr | Logically delete rows from a .vtr file |
| desc | Mark a column for descending sort order |
| diff_vtr | Compute the logical diff between two .vtr files |
| distinct | Keep distinct/unique rows |
| explain | Print the execution plan for a vectra query |
| filter | Filter rows of a vectra query |
| fuzzy_join | Fuzzy join two vectra tables by string distance |
| glimpse | Get a glimpse of a vectra table |
| group_by | Group a vectra query by columns |
| has_index | Check if a hash index exists for a .vtr column |
| head.vectra_node | Limit results to first n rows |
| left_join | Join two vectra tables |
| link | Define a link between a fact table and a dimension table |
| lookup | Look up columns from linked dimension tables |
| materialize | Materialize a vectra node into a reusable in-memory block |
| mutate | Add or transform columns |
| print.vectra_node | Print a vectra query node |
| pull | Extract a single column as a vector |
| reframe | Summarise with variable-length output per group |
| relocate | Relocate columns |
| rename | Rename columns |
| select | Select columns from a vectra query |
| slice | Select rows by position |
| slice_head | Select first or last rows |
| summarise | Summarise grouped data |
| tbl | Create a lazy table reference from a .vtr file |
| tbl_csv | Create a lazy table reference from a CSV file |
| tbl_sqlite | Create a lazy table reference from a SQLite database |
| tbl_tiff | Create a lazy table reference from a GeoTIFF raster |
| tbl_xlsx | Create a lazy table reference from an Excel (.xlsx) file |
| tiff_band_names | Read per-band names from a GeoTIFF |
| tiff_crs | Read CRS metadata from a GeoTIFF |
| tiff_extract_points | Extract raster values at point coordinates |
| tiff_metadata | Read GDAL_METADATA from a GeoTIFF |
| transmute | Keep only columns from mutate expressions |
| ungroup | Remove grouping from a vectra query |
| vec_build_overviews | Build overview pyramids for a .vec raster |
| vec_close_raster | Close a .vec raster handle |
| vec_extract_points | Extract band values at (x, y) points from a .vec raster |
| vec_open_raster | Open a .vec raster |
| vec_raster_layout | Tile layout of an open .vec raster |
| vec_raster_times | Distinct time stamps stored in a .vec time cube |
| vec_read_pixel_series | Read the full time series at a single pixel from a .vec time... |
| vec_read_time_slice | Read a single time slice from a .vec time cube |
| vec_read_window | Read a window of pixels from a .vec raster |
| vec_to_tiff | Export a .vec raster to GeoTIFF |
| vec_write_raster | Write a raster matrix or 3D array to a .vec raster file |
| vec_write_time_cube | Write a 4D time-cube raster to .vec |
| vtr_schema | Create a star schema over linked vectra tables |
| write_csv | Write query results or a data.frame to a CSV file |
| write_sqlite | Write query results or a data.frame to a SQLite table |
| write_tiff | Write query results to a GeoTIFF file |
| write_vtr | Write data to a .vtr file |
