Add tuple support #87
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Pull request overview
This PR adds ClickHouse Tuple handling and adjusts Array scanning to avoid panics when scanning arrays whose concrete Go type is not []any (e.g., []map[string]any), resolving reflect.Set assignability errors.
Changes:
- Add a
Tupletype handler and recognizeTuple(...)inunwrapCHType. - Change
Arrayscan targets/readers to useanyinstead of[]anyto accept concrete slice types returned by the driver. - Register the new
Tuplehandler in the ClickHouse type handler map.
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| func handleTuple(nullable bool) (any, func() any) { | ||
| if nullable { | ||
| var p *any | ||
| return &p, func() any { | ||
| if p == nil || *p == nil { |
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New code in handleTuple uses spaces for indentation and doesn’t match the rest of this Go file’s gofmt/tab formatting. Please run gofmt (or reformat this block) so indentation and brace alignment are consistent.
| func handleArray(nullable bool) (any, func() any) { | ||
| if nullable { | ||
| var p *[]any | ||
| return &p, func() any { | ||
| if p == nil { | ||
| return nil | ||
| } | ||
| return *p | ||
| } | ||
| } | ||
| var v []any | ||
| return &v, func() any { return v } | ||
| if nullable { | ||
| var p *any | ||
| return &p, func() any { | ||
| if p == nil || *p == nil { | ||
| return nil | ||
| } | ||
| return *p | ||
| } | ||
| } | ||
| var v any | ||
| return &v, func() any { return v } |
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handleTuple and handleArray now contain identical scan-target logic. Consider factoring this into a shared helper (e.g., reuse makeScanTargetany or introduce a dedicated handler for complex/unknown types) to avoid duplication and keep future fixes in one place.
| if strings.HasPrefix(s, "Tuple(") { | ||
| return "Tuple", nullable | ||
| } |
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The added Tuple() branch uses space-indentation and is misaligned vs the surrounding gofmt style. Please gofmt/reformat this block for consistency.
3 participants
Clickhouse doesn't support Tuple or Array(Tuple...)) data types. It caused panic
reflect.Set: value of type []map[string]interface {} is not assignable to type []interface{}The major reason for that was that handle array used var v []any as a result v couldn't be []map[string]interface {}. To fix that array right now expect any value because interface{} can be anything. It can be []map[string]interface {} and can be []string{} etc.
This PR fixes panic. General panic handler for all requests will be added in next PR.
Testing was done on local machine with multiple Clickhouse queries