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// SPDX-License-Identifier: GPL-3.0-or-later
package postgres
import "database/sql"
func (p *Postgres) doQueryColumns() error {
if err := p.doDBQueryColumns(p.db); err != nil {
p.Warning(err)
}
for _, conn := range p.dbConns {
if conn.db == nil {
continue
}
if err := p.doDBQueryColumns(conn.db); err != nil {
p.Warning(err)
}
}
return nil
}
func (p *Postgres) doDBQueryColumns(db *sql.DB) error {
q := queryColumnsStats()
for _, m := range p.mx.tables {
if m.nullColumns != nil {
m.nullColumns = newInt(0)
}
}
var dbname, schema, table string
var nullPerc int64
return p.doDBQuery(db, q, func(column, value string, rowEnd bool) {
switch column {
case "datname":
dbname = value
case "schemaname":
schema = value
case "relname":
table = value
case "null_percent":
nullPerc = parseInt(value)
}
if !rowEnd {
return
}
if nullPerc == 100 && p.hasTableMetrics(table, dbname, schema) {
v := p.getTableMetrics(table, dbname, schema)
if v.nullColumns == nil {
v.nullColumns = newInt(0)
}
*v.nullColumns++
}
})
}
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