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FA-45291 / Data systems / Open access

Column binding emits display names instead of stable field IDs · case 01

Column binding emits display names instead of stable field IDs.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

qualified-column-binding: Column binding emits display names instead of stable field IDs.

VERIFIED REPAIR

Preserve the stated physical representation and operation order: Resolve query references [qualifier-or-None,name] against schema entries [relation,name,field-id]. Unqualified names bind only when exactly one matching column exists. Qualified names use both relation and name; no candidates yields MISSING and several yield AMBIGUOUS. Return stable field IDs.

Unsuccessful approach: Relation aliases cannot identify individual bound fields.

Case contract

Resolve query references [qualifier-or-None,name] against schema entries [relation,name,field-id]. Unqualified names bind only when exactly one matching column exists. Qualified names use both relation and name; no candidates yields MISSING and several yield AMBIGUOUS. Return stable field IDs.

Why this case matters

A bounded deterministic data engine model makes representation and changelog faults reproducible.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(d):
    try:
        schema,references=d
        out=[]
        for qualifier,name in references:
            matches=[field for rel,col,field in schema if col==name and (qualifier is None or rel==qualifier)]
            if not matches: out.append('MISSING')
            elif len(matches)>1: out.append('AMBIGUOUS')
            else: out.append(name)
        return out
    except (IndexError, KeyError, ValueError, StopIteration) as exc:
        return {"representation_error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('qualified same name', solve([[['a', 'x', 1], ['b', 'x', 2]], [['b', 'x'], ['a', 'x']]]), [2, 1])
    check('ambiguous', solve([[['a', 'x', 1], ['b', 'x', 2]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 1]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 1]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 1]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 1]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 1]], [['a', 'x'], ['a', 'x']]]), [1, 1])
elif N == 2:
    check('qualified same name', solve([[['a', 'x', 2], ['b', 'x', 3]], [['b', 'x'], ['a', 'x']]]), [3, 2])
    check('ambiguous', solve([[['a', 'x', 2], ['b', 'x', 3]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 2]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 2]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 2]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 2]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 2]], [['a', 'x'], ['a', 'x']]]), [2, 2])
elif N == 3:
    check('qualified same name', solve([[['a', 'x', 3], ['b', 'x', 4]], [['b', 'x'], ['a', 'x']]]), [4, 3])
    check('ambiguous', solve([[['a', 'x', 3], ['b', 'x', 4]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 3]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 3]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 3]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 3]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 3]], [['a', 'x'], ['a', 'x']]]), [3, 3])
elif N == 4:
    check('qualified same name', solve([[['a', 'x', 4], ['b', 'x', 5]], [['b', 'x'], ['a', 'x']]]), [5, 4])
    check('ambiguous', solve([[['a', 'x', 4], ['b', 'x', 5]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 4]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 4]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 4]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 4]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 4]], [['a', 'x'], ['a', 'x']]]), [4, 4])
elif N == 5:
    check('qualified same name', solve([[['a', 'x', 5], ['b', 'x', 6]], [['b', 'x'], ['a', 'x']]]), [6, 5])
    check('ambiguous', solve([[['a', 'x', 5], ['b', 'x', 6]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 5]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 5]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 5]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 5]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 5]], [['a', 'x'], ['a', 'x']]]), [5, 5])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
qualified same name['x', 'x'][2, 1]Failed
ambiguous['AMBIGUOUS']['AMBIGUOUS']Passed
missing['MISSING']['MISSING']Passed
case-sensitive['MISSING']['MISSING']Passed
alias-prefix['MISSING']['MISSING']Passed
literal-space['MISSING']['MISSING']Passed
repeat ref['x', 'x'][1, 1]Failed

SHA-256 / 2559a09ea331a432e7fb8531a7eb2fcd4dff5f873ee3b988a975b93bf0cd85f0

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(d):
    try:
        schema,references=d
        out=[]
        for qualifier,name in references:
            matches=[field for rel,col,field in schema if col==name and (qualifier is None or rel==qualifier)]
            if not matches: out.append('MISSING')
            elif len(matches)>1: out.append('AMBIGUOUS')
            else: out.append(qualifier)
        return out
    except (IndexError, KeyError, ValueError, StopIteration) as exc:
        return {"representation_error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('qualified same name', solve([[['a', 'x', 1], ['b', 'x', 2]], [['b', 'x'], ['a', 'x']]]), [2, 1])
    check('ambiguous', solve([[['a', 'x', 1], ['b', 'x', 2]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 1]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 1]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 1]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 1]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 1]], [['a', 'x'], ['a', 'x']]]), [1, 1])
elif N == 2:
    check('qualified same name', solve([[['a', 'x', 2], ['b', 'x', 3]], [['b', 'x'], ['a', 'x']]]), [3, 2])
    check('ambiguous', solve([[['a', 'x', 2], ['b', 'x', 3]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 2]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 2]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 2]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 2]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 2]], [['a', 'x'], ['a', 'x']]]), [2, 2])
elif N == 3:
    check('qualified same name', solve([[['a', 'x', 3], ['b', 'x', 4]], [['b', 'x'], ['a', 'x']]]), [4, 3])
    check('ambiguous', solve([[['a', 'x', 3], ['b', 'x', 4]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 3]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 3]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 3]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 3]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 3]], [['a', 'x'], ['a', 'x']]]), [3, 3])
elif N == 4:
    check('qualified same name', solve([[['a', 'x', 4], ['b', 'x', 5]], [['b', 'x'], ['a', 'x']]]), [5, 4])
    check('ambiguous', solve([[['a', 'x', 4], ['b', 'x', 5]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 4]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 4]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 4]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 4]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 4]], [['a', 'x'], ['a', 'x']]]), [4, 4])
elif N == 5:
    check('qualified same name', solve([[['a', 'x', 5], ['b', 'x', 6]], [['b', 'x'], ['a', 'x']]]), [6, 5])
    check('ambiguous', solve([[['a', 'x', 5], ['b', 'x', 6]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 5]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 5]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 5]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 5]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 5]], [['a', 'x'], ['a', 'x']]]), [5, 5])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
qualified same name['b', 'a'][2, 1]Failed
ambiguous['AMBIGUOUS']['AMBIGUOUS']Passed
missing['MISSING']['MISSING']Passed
case-sensitive['MISSING']['MISSING']Passed
alias-prefix['MISSING']['MISSING']Passed
literal-space['MISSING']['MISSING']Passed
repeat ref['a', 'a'][1, 1]Failed

SHA-256 / 041e029ebafe022542b42771cae86fd19f32699874cca62f6ef0f877686a45a6

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(d):
    try:
        schema,references=d
        out=[]
        for qualifier,name in references:
            matches=[field for rel,col,field in schema if col==name and (qualifier is None or rel==qualifier)]
            if not matches: out.append('MISSING')
            elif len(matches)>1: out.append('AMBIGUOUS')
            else: out.append(matches[0])
        return out
    except (IndexError, KeyError, ValueError, StopIteration) as exc:
        return {"representation_error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('qualified same name', solve([[['a', 'x', 1], ['b', 'x', 2]], [['b', 'x'], ['a', 'x']]]), [2, 1])
    check('ambiguous', solve([[['a', 'x', 1], ['b', 'x', 2]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 1]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 1]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 1]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 1]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 1]], [['a', 'x'], ['a', 'x']]]), [1, 1])
elif N == 2:
    check('qualified same name', solve([[['a', 'x', 2], ['b', 'x', 3]], [['b', 'x'], ['a', 'x']]]), [3, 2])
    check('ambiguous', solve([[['a', 'x', 2], ['b', 'x', 3]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 2]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 2]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 2]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 2]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 2]], [['a', 'x'], ['a', 'x']]]), [2, 2])
elif N == 3:
    check('qualified same name', solve([[['a', 'x', 3], ['b', 'x', 4]], [['b', 'x'], ['a', 'x']]]), [4, 3])
    check('ambiguous', solve([[['a', 'x', 3], ['b', 'x', 4]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 3]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 3]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 3]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 3]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 3]], [['a', 'x'], ['a', 'x']]]), [3, 3])
elif N == 4:
    check('qualified same name', solve([[['a', 'x', 4], ['b', 'x', 5]], [['b', 'x'], ['a', 'x']]]), [5, 4])
    check('ambiguous', solve([[['a', 'x', 4], ['b', 'x', 5]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 4]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 4]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 4]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 4]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 4]], [['a', 'x'], ['a', 'x']]]), [4, 4])
elif N == 5:
    check('qualified same name', solve([[['a', 'x', 5], ['b', 'x', 6]], [['b', 'x'], ['a', 'x']]]), [6, 5])
    check('ambiguous', solve([[['a', 'x', 5], ['b', 'x', 6]], [[None, 'x']]]), ['AMBIGUOUS'])
    check('missing', solve([[['a', 'x', 5]], [['a', 'z']]]), ['MISSING'])
    check('case-sensitive', solve([[['a', 'X', 5]], [[None, 'x']]]), ['MISSING'])
    check('alias-prefix', solve([[['ab', 'x', 5]], [['a', 'x']]]), ['MISSING'])
    check('literal-space', solve([[['a', ' x ', 5]], [[None, 'x']]]), ['MISSING'])
    check('repeat ref', solve([[['a', 'x', 5]], [['a', 'x'], ['a', 'x']]]), [5, 5])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
qualified same name[2, 1][2, 1]Passed
ambiguous['AMBIGUOUS']['AMBIGUOUS']Passed
missing['MISSING']['MISSING']Passed
case-sensitive['MISSING']['MISSING']Passed
alias-prefix['MISSING']['MISSING']Passed
literal-space['MISSING']['MISSING']Passed
repeat ref[1, 1][1, 1]Passed

SHA-256 / 172e34efddeffbd867c2dd0e7f09a95ed7a78df4da9d281b336dbf148c81c1b1

Verification & scope

Offline stipulated semantics over valid small inputs; no performance, concurrency, or production-engine conformance claim. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:44:20.756112+00:00.

Case digest / 5049815457dbcaf05b2b04ea7a3a53a6d21ffa2d536c99bcbd7668c864992893