func (src *dataSourceInfo) FormatVar(buf *bytes.Buffer, f parser.FmtFlags, colIdx int) {
if f == parser.FmtQualify {
tableAlias := src.findTableAlias(colIdx)
if tableAlias.TableName != "" {
if tableAlias.DatabaseName != "" {
parser.FormatNode(buf, f, tableAlias.DatabaseName)
buf.WriteByte('.')
}
parser.FormatNode(buf, f, tableAlias.TableName)
buf.WriteByte('.')
}
}
buf.WriteString(src.sourceColumns[colIdx].Name)
}
func (src *dataSourceInfo) FormatVar(buf *bytes.Buffer, f parser.FmtFlags, colIdx int) {
if f.ShowTableAliases {
tableAlias, found := src.findTableAlias(colIdx)
if found {
if tableAlias.TableName != "" {
if tableAlias.DatabaseName != "" {
parser.FormatNode(buf, f, tableAlias.DatabaseName)
buf.WriteByte('.')
}
parser.FormatNode(buf, f, tableAlias.TableName)
buf.WriteByte('.')
}
} else {
buf.WriteString("_.")
}
}
buf.WriteString(src.sourceColumns[colIdx].Name)
}
func (s *selectNode) ExplainPlan(v bool) (name, description string, children []planNode) {
subplans := []planNode{s.source.plan}
subplans = s.planner.collectSubqueryPlans(s.filter, subplans)
for _, e := range s.render {
subplans = s.planner.collectSubqueryPlans(e, subplans)
}
if len(subplans) == 1 && !v {
return s.source.plan.ExplainPlan(v)
}
var buf bytes.Buffer
buf.WriteString("from (")
for i, col := range s.source.info.sourceColumns {
if i > 0 {
buf.WriteString(", ")
}
if col.hidden {
buf.WriteByte('*')
}
alias, found := s.source.info.findTableAlias(i)
if found {
parser.FormatNode(&buf, parser.FmtSimple, &alias)
} else {
buf.WriteByte('_')
}
buf.WriteByte('.')
parser.FormatNode(&buf, parser.FmtSimple, parser.Name(col.Name))
}
buf.WriteByte(')')
name = "render/filter"
if s.explain != explainNone {
name = fmt.Sprintf("%s(%s)", name, explainStrings[s.explain])
}
return name, buf.String(), subplans
}