Function ExprForSpan

pkg/sql/inverted/expression.go:519–525

ExprForSpan constructs a leaf-level SpanExpression for an inverted expression. Note that these leaf-level expressions may also have tight = false. Geospatial functions are all non-tight. For JSON, expressions like x <@ '{"a":1, "b":2}'::json will have tight = false. Say SpanA, SpanB correspond to "

(span Span, tight bool)

// be very wide when SpanA and SpanB are narrow, or vice versa,
// this tight expression would be very costly to evaluate.
func ExprForSpan(span Span, tight bool) *SpanExpression {
	return &SpanExpression{
		Tight:              tight,
		SpansToRead:        []Span{span},
		FactoredUnionSpans: []Span{span},
	}
}

// ContainsKeys traverses the SpanExpression to determine whether the span
// expression contains the given keys. It is primarily used for testing.