Method pgwireFormat

postgres/parser/sem/tree/pgwire_encode.go:93–141

(ctx *FmtCtx)

}

func (d *DArray) pgwireFormat(ctx *FmtCtx) {
	// When converting an array to text in "postgres mode" there is
	// special behavior: values are printed in "postgres mode" then the
	// result string itself is rendered in "postgres mode".
	// Immediate NULL array elements are printed as "NULL".
	//
	// In this last conversion, for *arrays* the special double quote
	// and backslash characters are *escaped* (not doubled).  Other
	// special characters from C like \t \n etc are not escaped and
	// instead printed as-is. Only non-valid characters get escaped to
	// hex. So we delegate this formatting to a tuple-specific
	// string printer called pgwireFormatStringInArray().
	switch d.ResolvedType().Oid() {
	case oid.T_int2vector, oid.T_oidvector:
		// vectors are serialized as a string of space-separated values.
		sep := ""
		// TODO(justin): add a test for nested arrays when #32552 is
		// addressed.
		for _, d := range d.Array {
			ctx.WriteString(sep)
			ctx.FormatNode(d)
			sep = " "
		}
		return
	}

	ctx.WriteByte('{')
	comma := ""
	for _, v := range d.Array {
		ctx.WriteString(comma)
		switch dv := UnwrapDatum(v).(type) {
		case NullLiteral:
			ctx.WriteString("NULL")
		case *DString:
			pgwireFormatStringInArray(&ctx.Buffer, string(*dv))
		case *DCollatedString:
			pgwireFormatStringInArray(&ctx.Buffer, dv.Contents)
			// Bytes cannot use the default case because they will be incorrectly
			// double escaped.
		case *DBytes:
			ctx.FormatNode(dv)
		default:
			s := AsStringWithFlags(v, ctx.flags)
			pgwireFormatStringInArray(&ctx.Buffer, s)
		}
		comma = ","
	}
	ctx.WriteByte('}')
}

var tupleQuoteSet, arrayQuoteSet asciiSet