When querying an empty table, 'rows.Columns' has no value

[linlexing]

When querying an empty table, 'rows.Columns' has no value,but github.com/lib/pq returns the correct result

package main

import (
    "database/sql"

    "github.com/davecgh/go-spew/spew"
    _ "github.com/jackc/pgx/v4/stdlib"
    _ "github.com/lib/pq"
)

const dburl = "postgres://xxx:xxx@localhost:5432/postgres?sslmode=disable"

func main() {
    func() {
        db, err := sql.Open("pgx", dburl)
        if err != nil {
            panic(err)
        }
        rows, err := db.Query("select 1 where 1=2")
        if err != nil {
            panic(err)
        }
        defer rows.Close()
        cols, err := rows.Columns()
        if err != nil {
            panic(err)
        }
        println("pgx columns:")
        spew.Dump(cols)
    }()
    func() {
        db, err := sql.Open("postgres", dburl)
        if err != nil {
            panic(err)
        }
        rows, err := db.Query("select 1 where 1=2")
        if err != nil {
            panic(err)
        }
        defer rows.Close()
        cols, err := rows.Columns()
        if err != nil {
            panic(err)
        }
        println("pq columns:")
        spew.Dump(cols)
    }()
}

output:

pgx columns:
([]string) {
}
pq columns:
([]string) (len=1 cap=1) {
 (string) (len=8) "?column?"
}

[linlexing]

Sorry, I misplaced it