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fix(chcol): return true from HasType when the Variant carries a type - #2006
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Variant.HasType compared chType against the empty string with ==, so it returned true for a Variant or Dynamic built without a type and false for one built with NewVariantWithType, NewDynamicWithType or WithType. That is the opposite of its doc comment and of Type(), which returns chType. Flip the comparison and add a table test over every constructor in lib/chcol that asserts HasType agrees with Type() != "".
🤖 Claude reviewFlips the inverted comparison in Verified:
Release note: because the method has returned the inverted value since v2.30.1, any external caller who negated the result as a workaround will see a behavior change. Worth a one-line mention in the changelog, as the PR description already suggests. Blind spots: could not execute the test suite in this environment (branch checkout was blocked), so passing status relies on tracing rather than a run; CI covers this. Verdict: ✅ Approve Inline comments are attached to the relevant lines. This summary updates in place on re-review. |
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Summary
Variant.HasTypeinlib/chcol/variant.goreturnedv.chType == "", so it reported true for aVariantorDynamicbuilt withNewVariantorNewDynamic, which carry no type, and false for one built withNewVariantWithType,NewDynamicWithTypeorWithType, which do. That is the inverse of its doc comment ("returns true if the value has a type ClickHouse included") and of the sibling accessorType(), which returnsv.chType. This PR flips the comparison tov.chType != "".The inversion is as old as the method.
HasTypewas added in 6c5abcb as part of #1453 and first shipped in v2.30.1, so no release has ever returned the documented value.Nothing inside this repository calls
HasType. Onmain,grep -rn HasTypematches only the declaration, and the method appears nowhere inexamples/,tests/or the ClickHouse docs repository. A GitHub code search for Go files containing both.HasType()andclickhouse-goreturns no results, and the search API's hits forHasTypetogether withchcolorclickhouseare vendored copies ofvariant.goitself plus unrelated identifiers in other projects.Breaking change assessment: this is a bug fix, not a breaking change. The signature is unchanged, the new behavior is the one the doc comment has promised since v2.30.1, no caller inside the repository depends on the inverted result, and a GitHub code search finds none outside it. The one caller who could notice is one who observed the inversion and negated the result to work around it; they would remove that negation after upgrading, which is the normal consequence of a bug fix and worth one line in the release notes.
Tests:
lib/chcol/variant_test.goaddsTestVariantHasType, a table test overNewVariant,NewVariantWithType(including a nil value with a type),WithType,NewDynamicandNewDynamicWithType. It assertsHasTypedirectly and that it agrees withType() != "". Before the fix all six subtests fail with the inverted value; after the fixgo test -race -count=1 ./lib/chcol/passes andgolangci-lint runwith the repository config reports zero issues. There is notests/issues/regression test because the method is a pure in-memory accessor that never talks to a server, and there is no open issue for it.Checklist