flux_gen.go

// DO NOT EDIT: This file is autogenerated via the builtin command.

package geo

import (
	ast "github.com/wolffcm/flux/ast"
	runtime "github.com/wolffcm/flux/runtime"
)

func init() {
	runtime.RegisterPackage(pkgAST)
}

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				Source: "package geo\n\n//\n// None of the builtin functions are intended to be used by end users.\n//\n\n// Check whether lat/lon is in specified region.\nbuiltin containsLatLon\n\n// Calculates grid (set of cell ID tokens) for given region and according to options.\nbuiltin getGrid\n\n// Returns level of specified cell ID token.\nbuiltin getLevel\n\n// Returns cell ID token for given cell or lat/lon point at specified level.\nbuiltin s2CellIDToken\n\n//\n// Flux\n//\n\n// Gets level of cell ID tag `s2cellID` from the first record from the first table from the stream.\n_detectLevel = (tables=<-) => {\n  _r0 =\n    tables\n      |> tableFind(fn: (key) => exists key.s2_cell_id)\n      |> getRecord(idx: 0)\n  _level =\n    if exists _r0 then\n      getLevel(token: _r0.s2_cell_id)\n    else\n       666\n  return _level\n}\n\n//\n// Convenience functions\n//\n\n// Collects values to row-wise sets.\ntoRows = (tables=<-, correlationKey=[\"_time\"]) =>\n  tables\n    |> pivot(\n      rowKey: correlationKey,\n      columnKey: [\"_field\"],\n      valueColumn: \"_value\"\n    )\n\n//\n// Filtering functions\n//\n\n// Filters records by a box, a circle or a polygon area using S2 cell ID tag.\n// It is a coarse filter, as the grid always overlays the region, the result will likely contain records\n// with lat/lon outside the specified region.\ngridFilter = (tables=<-, region, minSize=24, maxSize=-1, level=-1, s2cellIDLevel=-1) => {\n  _s2cellIDLevel =\n    if s2cellIDLevel == -1 then\n      tables\n        |> _detectLevel()\n    else\n      s2cellIDLevel\n  _grid = getGrid(region: region, minSize: minSize, maxSize: maxSize, level: level, maxLevel: _s2cellIDLevel)\n  return\n    tables\n      |> filter(fn: (r) =>\n        if _grid.level == _s2cellIDLevel then\n          contains(value: r.s2_cell_id, set: _grid.set)\n        else\n          contains(value: s2CellIDToken(token: r.s2_cell_id, level: _grid.level), set: _grid.set)\n      )\n}\n\n// Filters records by specified region.\n// It is an exact filter and must be used after `toRows()` because it requires `lat` and `lon` columns in input row sets.\nstrictFilter = (tables=<-, region) =>\n  tables\n    |> filter(fn: (r) =>\n      containsLatLon(region: region, lat: r.lat, lon: r.lon)\n    )\n\n// Two-phase filtering by speficied region.\n// Returns rows of fields correlated by `correlationKey`.\nfilterRows = (tables=<-, region, minSize=24, maxSize=-1, level=-1, s2cellIDLevel=-1, correlationKey=[\"_time\"], strict=true) => {\n  _rows =\n    tables\n      |> gridFilter(region: region, minSize: minSize, maxSize: maxSize, level: level, s2cellIDLevel: s2cellIDLevel)\n      |> toRows(correlationKey)\n  _result =\n    if strict then\n      _rows\n        |> strictFilter(region)\n    else\n      _rows\n  return _result\n}\n\n//\n// Grouping functions\n//\n// intended to be used row-wise sets (i.e after `toRows()`)\n\n// Groups data by area of size specified by level. Result is grouped by `newColumn`.\n// Grouping levels: https://s2geometry.io/resources/s2cell_statistics.html\ngroupByArea = (tables=<-, newColumn, level, s2cellIDLevel=-1) => {\n  _s2cellIDLevel =\n    if s2cellIDLevel == -1 then\n      tables\n        |> _detectLevel()\n    else\n      s2cellIDLevel\n  _prepared =\n    if level == _s2cellIDLevel then\n      tables\n\t    |> duplicate(column: \"s2_cell_id\", as: newColumn)\n    else\n      tables\n        |> map(fn: (r) => ({\n             r with\n               _s2_cell_id_xxx: s2CellIDToken(point: {lat: r.lat, lon: r.lon}, level: level)\n           }))\n        |> rename(columns: { _s2_cell_id_xxx: newColumn })\n  return\n    _prepared\n      |> group(columns: [newColumn])\n}\n\n// Groups rows into tracks.\nasTracks = (tables=<-, groupBy=[\"id\",\"tid\"], orderBy=[\"_time\"]) =>\n  tables\n    |> group(columns: groupBy)\n    |> sort(columns: orderBy)",
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