Method Format

postgres/parser/sem/tree/datum.go:1481–1526

Format implements the NodeFormatter interface.

(ctx *FmtCtx)

// Format implements the NodeFormatter interface.
func (d *DTuple) Format(ctx *FmtCtx) {
	if ctx.HasFlags(fmtPgwireFormat) {
		d.pgwireFormat(ctx)
		return
	}

	typ := d.ResolvedType()
	showLabels := len(typ.TupleLabels()) > 0
	if showLabels {
		ctx.WriteByte('(')
	}
	ctx.WriteByte('(')
	comma := ""
	parsable := ctx.HasFlags(FmtParsable)
	for i, v := range d.D {
		ctx.WriteString(comma)
		ctx.FormatNode(v)
		if parsable && (v == DNull) && len(typ.TupleContents()) > i {
			// If Tuple has types.Unknown for this slot, then we can't determine
			// the column type to write this annotation. Somebody else will provide
			// an error message in this case, if necessary, so just skip the
			// annotation and continue.
			if typ.TupleContents()[i].Family() != types.UnknownFamily {
				ctx.WriteString("::")
				ctx.WriteString(typ.TupleContents()[i].SQLString())
			}
		}
		comma = ", "
	}
	if len(d.D) == 1 {
		// Ensure the pretty-printed 1-value tuple is not ambiguous with
		// the equivalent value enclosed in grouping parentheses.
		ctx.WriteByte(',')
	}
	ctx.WriteByte(')')
	if showLabels {
		ctx.WriteString(" AS ")
		comma := ""
		for i := range typ.TupleLabels() {
			ctx.WriteString(comma)
			ctx.FormatNode((*Name)(&typ.TupleLabels()[i]))
			comma = ", "
		}
		ctx.WriteByte(')')
	}
}

// Sorted returns true if the tuple is known to be sorted (and contains no
// NULLs).