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miller/pkg/transformers
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John Kerl d415ca7655
Add mlr describe schema/shape introspection verb (#2098 PR6) (#2132) 
One output record per input field: types seen with counts, occurrence
count, null count, cardinality, min/max, and -- for fields within the
-n/--max-values cap -- the complete distinct-value list in first-seen
order. `mlr --ojson describe` is the machine-readable form; nested
types/values flatten in tabular formats.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
2026-07-03 18:43:49 -04:00
..
utils Convert if/else-if chains to typed switch statements (staticcheck QF1003) (#2112) 2026-06-28 18:27:42 -04:00
aaa_chain_transformer.go Performance and style fixes (#1981) 2026-02-18 09:19:31 -05:00
aaa_record_transformer.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
aaa_transformer_json.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
aaa_transformer_json_test.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
aaa_transformer_table.go Add mlr describe schema/shape introspection verb (#2098 PR6) (#2132) 2026-07-03 18:43:49 -04:00
aaa_verb_usage.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
altkv.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
bar.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
bootstrap.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
case.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
cat.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
check.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
clean_whitespace.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
count.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
count_similar.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
cut.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
decimate.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
describe.go Add mlr describe schema/shape introspection verb (#2098 PR6) (#2132) 2026-07-03 18:43:49 -04:00
doc.go Export library code in pkg/ (#1391) 2023-09-10 17:15:13 -04:00
fill_down.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
fill_empty.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
flatten.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
format_values.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
fraction.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
gap.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
grep.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
group_by.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
group_like.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
having_fields.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
head.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
histogram.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
join.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
json_parse.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
json_stringify.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
label.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
latin1_to_utf8.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
merge_fields.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
most_or_least_frequent.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
nest.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
nothing.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
put_or_filter.go Add DSL validate/dry-run: put/filter --explain (#2098 PR5) (#2131) 2026-07-03 18:12:23 -04:00
README.md Export library code in pkg/ (#1391) 2023-09-10 17:15:13 -04:00
regularize.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
remove_empty_columns.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
rename.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
reorder.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
repeat.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
reshape.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
sample.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
sec2gmt.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
sec2gmtdate.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
seqgen.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
shuffle.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
skip_trivial_records.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
sort.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
sort_within_records.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
sparsify.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
split.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
stats1.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
stats2.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
step.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
subs.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
summary.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
surv.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
tac.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
tail.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
tee.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
template.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
top.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
unflatten.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
uniq.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
unspace.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
unsparsify.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00
utf8_to_latin1.go Tier-2 structured verb options: OptionSpec, initial migration (#2098) (#2111) 2026-07-03 14:27:23 -04:00

README.md

Logic for transforming input records into output records as requested by the user (sort, filter, etc.).:

  • The IRecordTransformer abstract record-transformer interface datatype, as well as the ChainTransformer Go-channel chaining mechanism for piping one transformer into the next.
  • The transformer lookup table, used for Miller command-line parsing, verb construction, and online help.
  • All the concrete record-transformers such as cat, tac, sort, put, and so on.