Fix FULL OUTER JOIN COALESCE in MIMIC-IV height concept

[Chessing234]

Summary

• Fix ht_stg0 in MIMIC-IV height.sql to use h2 columns in COALESCE fallbacks for subject_id, stay_id, and charttime
• Apply the same fix across BigQuery, Postgres, and DuckDB concept builds

Problem

The FULL OUTER JOIN between inch-based (ht_in) and cm-based (ht_cm) height measurements used COALESCE(h1.col, h1.col), which never falls back to h2 values. Height records present only in ht_in were excluded from the derived table.

Test plan

• Rebuild mimiciv_derived.height and verify inch-only measurements are retained
• Compare row counts before/after on a sample MIMIC-IV install

Fixes #2010

Made with Cursor

[alistairewj]

thanks for the fix - AFAIK this actually doesn't impact the data in the end, because those itemid have duplicate values across all rows - but it still makes sense to fix!