// rewriteSelectStatement performs any necessary query re-writing.
func (lm *SelectMapper) rewriteSelectStatement(stmt *influxql.SelectStatement) (*influxql.SelectStatement, error) {
var err error
// Expand regex expressions in the FROM clause.
sources, err := expandSources(stmt.Sources, lm.shard.index)
if err != nil {
return nil, err
}
stmt.Sources = sources
// Expand wildcards in the fields or GROUP BY.
stmt, err = lm.expandWildcards(stmt)
if err != nil {
return nil, err
}
stmt.RewriteDistinct()
return stmt, nil
}
// RewriteSelectStatement performs any necessary query re-writing.
func (db *DatabaseIndex) RewriteSelectStatement(stmt *influxql.SelectStatement) (*influxql.SelectStatement, error) {
// Expand regex expressions in the FROM clause.
sources, err := db.ExpandSources(stmt.Sources)
if err != nil {
return nil, err
}
stmt.Sources = sources
// Expand wildcards in the fields or GROUP BY.
stmt, err = db.ExpandWildcards(stmt)
if err != nil {
return nil, err
}
stmt.RewriteDistinct()
return stmt, nil
}
// rewriteSelectStatement performs any necessary query re-writing.
func (q *QueryExecutor) rewriteSelectStatement(stmt *influxql.SelectStatement) (*influxql.SelectStatement, error) {
var err error
// Expand regex expressions in the FROM clause.
sources, err := q.expandSources(stmt.Sources)
if err != nil {
return nil, err
}
stmt.Sources = sources
// Expand wildcards in the fields or GROUP BY.
if stmt.HasWildcard() {
stmt, err = q.expandWildcards(stmt)
if err != nil {
return nil, err
}
}
stmt.RewriteDistinct()
return stmt, nil
}