Correctly handle CSV files with a single separator throughout #3186
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better auto-detection of CSV delimiter - files with a tsv extension are automatically detected as tab delimited - other files parsed as CSV go through the following steps: - if the first line contains at least 3 of the same separator, it uses that separator as a delimiter - if the first line contains only one supported separator character, it uses that separator as a delimiter - otherwise it falls back to treating all supported delimiters as the delimiter supported delimiters, in precedence order: - comma `,` - semi-colon `;` - tab `\t` - pipe `|`
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fixes #3127 and fixes #2078
better auto-detection of CSV delimiter
supported delimiters, in precedence order:
,;\t|