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feat: support IS UNKNOWN expressions - #399

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cloudspannerecosystem:mainfrom
apstndb:feat/is-unknown
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feat: support IS UNKNOWN expressions#399
apstndb wants to merge 1 commit into
cloudspannerecosystem:mainfrom
apstndb:feat/is-unknown

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@apstndb

@apstndb apstndb commented Aug 11, 2026

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This PR adds support for IS [NOT] UNKNOWN expression.

Comment thread ast/ast.go

// IsUnknownExpr is IS UNKNOWN expression node.
//
// {{.Left | sql}} IS {{if .Not}}NOT{{end}} UNKNOWN

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Is this better?

Suggested change
// {{.Left | sql}} IS {{if .Not}}NOT{{end}} UNKNOWN
// {{.Left | sql}} IS{{if .Not}} NOT{{end}} UNKNOWN

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