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# Description Pretty much all operations/commands in Nushell assume that the column names/keys in a record and thus also in a table (which consists of a list of records) are unique. Access through a string-like cell path should refer to a single column or key/value pair and our output through `table` will only show the last mention of a repeated column name. ```nu [[a a]; [1 2]] ╭─#─┬─a─╮ │ 0 │ 2 │ ╰───┴───╯ ``` While the record parsing already either errors with the `ShellError::ColumnDefinedTwice` or silently overwrites the first occurence with the second occurence, the table literal syntax `[[header columns]; [val1 val2]]` currently still allowed the creation of tables (and internally records with more than one entry with the same name. This is not only confusing, but also breaks some assumptions around how we can efficiently perform operations or in the past lead to outright bugs (e.g. #8431 fixed by #8446). This PR proposes to make this an error. After this change another hole which allowed the construction of records with non-unique column names will be plugged. ## Parts - Fix `SE::ColumnDefinedTwice` error code - Remove previous tests permitting duplicate columns - Deny duplicate column in table literal eval - Deny duplicate column in const eval - Deny duplicate column in `from nuon` # User-Facing Changes `[[a a]; [1 2]]` will now return an error: ``` Error: nu:🐚:column_defined_twice × Record field or table column used twice ╭─[entry #2:1:1] 1 │ [[a a]; [1 2]] · ┬ ┬ · │ ╰── field redefined here · ╰── field first defined here ╰──── ``` this may under rare circumstances block code from evaluating. Furthermore this makes some NUON files invalid if they previously contained tables with repeated column names. # Tests + Formatting Added tests for each of the different evaluation paths that materialize tables. |
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|---|---|---|
| .. | ||
| nu_plugin_custom_values | ||
| nu_plugin_example | ||
| nu_plugin_formats | ||
| nu_plugin_gstat | ||
| nu_plugin_inc | ||
| nu_plugin_python | ||
| nu_plugin_query | ||
| nu-cli | ||
| nu-cmd-base | ||
| nu-cmd-dataframe | ||
| nu-cmd-extra | ||
| nu-cmd-lang | ||
| nu-color-config | ||
| nu-command | ||
| nu-engine | ||
| nu-explore | ||
| nu-glob | ||
| nu-json | ||
| nu-parser | ||
| nu-path | ||
| nu-plugin | ||
| nu-pretty-hex | ||
| nu-protocol | ||
| nu-std | ||
| nu-system | ||
| nu-table | ||
| nu-term-grid | ||
| nu-test-support | ||
| nu-utils | ||
| README.md | ||
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.