[quinnj]

Depends on #27 and its #26 foundation. This follow-up corrects the element type of returned JSON columns.

For jsontable("{\"a\":[1,2]}"), the schema declares integer values but the returned column currently declares a JSON array as its element type. collect(column) then tries to convert each integer into that array type and throws MethodError. Null-converting columns have the same mismatch.

Give the wrapper separate parameters for its scalar element type and its source array type. Reuse the existing column-type conversion, retaining the source array field and direct indexing without copying it. Column access through a name, position, or property now advertises the same value type as the schema.

Validation:

• The preceding public probe has 24 passes, 21 incorrect-element-type failures and 18 collection errors.
• All 63 public regression checks pass across integers, mixed nulls, all-null values, strings, empty columns, nested objects and nested arrays, through all three column-access forms. They verify schema/element-type agreement, collect and existing copy behavior.
• The full 203-check suite passes on Julia 1.6.7 and 1.13.0 with four threads and forced bounds checks; git diff --check passes.
• All six checks pass at 9923fe14f59c0acc884c0f810aca91c31dec6f70: all four native jobs in run 37186473791, including Julia 1.0, plus both Codecov checks. All four coverage sessions were accepted at the correct repository/commit destination; the stable job uploaded 889 bytes and the final report is 95.87%. Merge remains held for prerequisite Validate empty and null JSON columns #27 and required independent approval.

Co-authored by Codex

AI disclosure: This work was prepared with assistance from OpenAI Codex.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.81%. Comparing base (b466c6b) to head (4d10ffa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   93.75%   93.81%   +0.06%     
==========================================
  Files           1        1              
  Lines          96       97       +1     
==========================================
+ Hits           90       91       +1     
  Misses          6        6              

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