miller/c/draft-release-notes.md

This is a relatively minor release, containing feature requests.

Features:

• There is a new DSL function mapexcept which returns a copy of the argument with specified key(s), if any, unset. Likewise, mapselect returns a copy of the argument with only specified key(s), if any, set. This resolves https://github.com/johnkerl/miller/issues/137.

• xxx min/max functions and stats1/merge-fields min/max/percentile mix int and string. esp. string-only order statistics. doclink for mixed case. interpolation obv nonsensical.

• A new -u option for count-distinct allows unlashed counts for multiple field names. For example, with -f a,b and without -u, count-distinct computes counts for distinct pairs of a and b field values. With -f a,b and with -u, it computes counts for distinct a field values and counts for distinct b field values separately.

• xxx ./configure vs. autoreconf -fiv 1st, and which issue is resolved by this.

• xxx UTF-8 BOM strip for CSV files; resolves xxx

• For put and filter with -S, program literals such as the 6 in $x = 6 were being parsed as strings. This is not sensible, since the -S option for put and filter is intended to suppress numeric conversion of record data, not program literals. To get string 6 one may use $x = "6".

Documentation:

• Suppose you have counters in a SQL database with different values in successive queries. A new cookbook example shows how to compute differences between successive queries.

• Another new cookbook example shows how to compute interquartile ranges

Bugfixes:

• CRLF line-endings were not being correctly autodetected when I/O formats were specified using --c2j et al.

• Integer division by zero was causing a fatal runtime exception, rather than computing inf or nan as in the floating-point case.