Method Format

postgres/parser/sem/tree/expr.go:1516–1555

Format implements the NodeFormatter interface.

(ctx *FmtCtx)

// Format implements the NodeFormatter interface.
func (node *CastExpr) Format(ctx *FmtCtx) {
	switch node.SyntaxMode {
	case CastPrepend:
		// This is a special case for things like INTERVAL '1s'. These only work
		// with string constants; if the underlying expression was changed, we fall
		// back to the short syntax.
		if _, ok := node.Expr.(*StrVal); ok {
			ctx.FormatTypeReference(node.Type)
			ctx.WriteByte(' ')
			ctx.FormatNode(node.Expr)
			break
		}
		fallthrough
	case CastShort:
		exprFmtWithParen(ctx, node.Expr)
		ctx.WriteString("::")
		ctx.FormatTypeReference(node.Type)
	default:
		ctx.WriteString("CAST(")
		ctx.FormatNode(node.Expr)
		ctx.WriteString(" AS ")
		if typ, ok := GetStaticallyKnownType(node.Type); ok && typ.Family() == types.CollatedStringFamily {
			// Need to write closing parentheses before COLLATE clause, so create
			// equivalent string type without the locale.
			strTyp := types.MakeScalar(
				types.StringFamily,
				typ.Oid(),
				typ.Precision(),
				typ.Width(),
				"", /* locale */
			)
			ctx.WriteString(strTyp.SQLString())
			ctx.WriteString(") COLLATE ")
			lex.EncodeLocaleName(&ctx.Buffer, typ.Locale())
		} else {
			ctx.FormatTypeReference(node.Type)
			ctx.WriteByte(')')
		}
	}
}

// NewTypedCastExpr returns a new CastExpr that is verified to be well-typed.
func NewTypedCastExpr(expr TypedExpr, typ *types.T) *CastExpr {