metabase / metabase/metabase

Custom Expression functions `Median()` and `Percentile()` not available for Vertica

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.Limitation Database/Vertica Querying/Notebook/Custom Expression Type:New Feature
Dominant language
Clojure
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Description

**Describe the bug**
Custom Expression functions `Median()` and `Percentile()` not available for Vertica

**To Reproduce**
1. Custom question > (your Vertica database and a table)
2. Summarize > Custom Expression > list of functions should include `Median` and `Percentile`.

**Information about your Metabase Installation:**
Metabase 0.35.4

**Additional context**
Related to #12222

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start at Custom question > Summarize > Custom Expression and trace how the function list is built for Vertica. Compare the available functions with the requested Median and Percentile support, then verify that both appear for a Vertica database without changing behavior for other databases.

Written by the indexing model from the issue text.

Assessment

Tech stack
clojure, sql
Domain
databases
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
42/100

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