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Changelog

Source: NEWS.md

dtlog 0.1.0

  • First release.

  • Logs data.table operations: the subsetting method [.data.table reports filters, sorts, column selection, modification by reference, grouping, aggregation and joins.

  • Logs the exported data.table functions merge(), unique(), duplicated(), na.omit(), head(), tail(), rbindlist(), melt(), dcast(), as.data.table(), fread(), fwrite(), the set*() family and the set operations funion(), fintersect() and fsetdiff().

  • The operations are left untouched. Results, visibility, modification by reference, keys and indices are those of data.table, and every argument is evaluated exactly as often as data.table evaluates it: dtlog never computes an argument a second time in order to describe what a call did.

  • dttable() describes the variables of a single data table – one row per column, with the number of unique values and the values themselves – and passes every other call on to base::table() unchanged. It is a function of its own; dtlog does not mask base::table().

  • dt_log() and dt_log_end() write the messages to a transcript file, dt_log_file() reports where it is going, and dtlog_summary() reports the size and key of a table. dt_log() has no default path: the transcript is written where you name it and nowhere else.

  • dtlog_pause() and dtlog_resume() turn logging off and on. The options dtlog.display, dtlog.detail, dtlog.log_from_packages and dtlog.table_max_unique control where the output goes and how much of it there is.