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CSVLint
CSV Lint plug-in for Notepad++ for syntax highlighting, csv validation, automatic column and datatype detecting, fixed width datasets, change datetime format, decimal separator, sort data, count unique values, convert to xml, json, sql etc. A plugin for data cleaning and working with messy data files.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The CSV Lint plug-in for Notepad++ was updated recently, it's available in the latest release of Notepad++ (v8.5.3). It is a useful plug-in for anyone working with csv datasets. I have created the plugin and had posted about it before, and this latest update has some more improvements and bugfixes.
Check out the CSVQuery plugin too. https://github.com/jokedst/CsvQuery
Are you maybe referring to EDIFACT type files, so files where the first column value determines what type of row it is? Maybe you can take a look at this example lexer although it's not a fully functional plugin it does take into account the first character of a row.