Contributed view operators
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debugv - like 'do' but shows ops and intermediate results as subviews
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extend - add a column that is constructed from an expression on each row
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lag - adds a new column with a value from the given column in the previous row
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lead - adds a new column with a value from the given column in the next row
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ngroup - shorthand way of performing several levels of grouping at once
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oratcl - SQL query on oracle database is returned as a view. Requires oratcl
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partition - Group, transform subview, then ungroup.
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pivot - returns a cross-tabulation of the given column names
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ratk - a Tk based view browser
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sqlite - SQL query on sqlite database is returned as a view. Requires sqlite
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tostring - converts a column to string type
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vsplit - splits each cell of a given column into a subview (one row per list element)
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accum - accumulate values in a column
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datefmt - format a date column via Tcl's [clock format]
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fill - fill holes in a column with values from previous rows
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fillfrom - fill holes in a column with values from another column
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trimleft - trim string from left side of column values
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dupcol - duplicate a column
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vregsub - apply regsub to a column's values
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range - like slice but understands "end" + expressions like "end - 1"
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shape - returns column containing number of rows in specified subview
