Function typeCheckSplitExprs

postgres/parser/sem/tree/type_check.go:2215–2229

typeCheckSplitExprs splits the expressions into three groups of indexes: - Constants - Placeholders - All other Exprs

(
	ctx context.Context, semaCtx *SemaContext, exprs []Expr,
)

// - Placeholders
// - All other Exprs
func typeCheckSplitExprs(
	ctx context.Context, semaCtx *SemaContext, exprs []Expr,
) (constIdxs []int, placeholderIdxs []int, resolvableIdxs []int) {
	for i, expr := range exprs {
		switch {
		case isConstant(expr):
			constIdxs = append(constIdxs, i)
		case semaCtx.isUnresolvedPlaceholder(expr):
			placeholderIdxs = append(placeholderIdxs, i)
		default:
			resolvableIdxs = append(resolvableIdxs, i)
		}
	}
	return constIdxs, placeholderIdxs, resolvableIdxs
}

// typeCheckTupleComparison type checks a comparison between two tuples,
// asserting that the elements of the two tuples are comparable at each index.