VirtualCsvSource (Deedle)

VirtualCsvSource Module

Namespace: Deedle.Virtual.Sources
Assembly: Deedle.dll

Functions and values

Function or value	Description
`createColumnSource lineIndex columnName stringLookupRange` Full Usage: `createColumnSource lineIndex columnName stringLookupRange` Parameters: lineIndex : `CsvLineIndex` columnName : `string` stringLookupRange : `LookupRangeMode<string> option` Returns: `IVirtualVectorSource`	Create a value column source for a CSV file (type inferred from sample rows). lineIndex : `CsvLineIndex` columnName : `string` stringLookupRange : `LookupRangeMode<string> option` Returns: `IVirtualVectorSource`
`createConcatenatedFrame csvPaths options` Full Usage: `createConcatenatedFrame csvPaths options` Parameters: csvPaths : `string[]` options : `VirtualReadCsvOptions` Returns: `Frame<int64, string>`	Concatenate CSV files as one ordinal virtual frame (sorted paths). Shared schema required. Uses linear 0..N-1 addressing so existing [`OrdinalVirtualSource`] LookupRange applies as-is. csvPaths : `string[]` options : `VirtualReadCsvOptions` Returns: `Frame<int64, string>`
`createFrame csvPath options` Full Usage: `createFrame csvPath options` Parameters: csvPath : `string` options : `VirtualReadCsvOptions` Returns: `objnull`	Build a virtual frame from a CSV file (boxed; unbox at the API boundary). With `IndexColumn = None`, uses ordinal rows `0 .. N-1`. With `IndexColumn = Some name`, uses that column when strictly increasing and unique in file order; otherwise ordinal with a trace warning. csvPath : `string` options : `VirtualReadCsvOptions` Returns: `objnull`
`createIndexSource lineIndex columnName` Full Usage: `createIndexSource lineIndex columnName` Parameters: lineIndex : `CsvLineIndex` columnName : `string` Returns: `IVirtualVectorSource`	lineIndex : `CsvLineIndex` columnName : `string` Returns: `IVirtualVectorSource`
`createOrdinalFrame csvPath options` Full Usage: `createOrdinalFrame csvPath options` Parameters: csvPath : `string` options : `VirtualReadCsvOptions` Returns: `Frame<int64, string>`	Build a virtual frame with ordinal row index `0 .. N-1`. csvPath : `string` options : `VirtualReadCsvOptions` Returns: `Frame<int64, string>`
`resolveIndexColumnName header options` Full Usage: `resolveIndexColumnName header options` Parameters: header : `string[]` options : `VirtualReadCsvOptions` Returns: `string`	Resolve the configured index column name, if any. header : `string[]` options : `VirtualReadCsvOptions` Returns: `string`