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group_by.go
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/
group_by.go
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package clause
// GroupBy group by clause
type GroupBy struct {
Columns []Column
Having []Expression
}
// Name from clause name
func (groupBy GroupBy) Name() string {
return "GROUP BY"
}
// Build build group by clause
func (groupBy GroupBy) Build(builder Builder) {
for idx, column := range groupBy.Columns {
if idx > 0 {
builder.WriteByte(',')
}
builder.WriteQuoted(column)
}
if len(groupBy.Having) > 0 {
builder.WriteString(" HAVING ")
Where{Exprs: groupBy.Having}.Build(builder)
}
}
// MergeClause merge group by clause
func (groupBy GroupBy) MergeClause(clause *Clause) {
if v, ok := clause.Expression.(GroupBy); ok {
copiedColumns := make([]Column, len(v.Columns))
copy(copiedColumns, v.Columns)
groupBy.Columns = append(copiedColumns, groupBy.Columns...)
copiedHaving := make([]Expression, len(v.Having))
copy(copiedHaving, v.Having)
groupBy.Having = append(copiedHaving, groupBy.Having...)
}
clause.Expression = groupBy
if len(groupBy.Columns) == 0 {
clause.Name = ""
} else {
clause.Name = groupBy.Name()
}
}