Method DropIndex

backend/store/model/database.go:1219–1245

DropIndex drops an index from the table. Returns an error if the index does not exist.

(indexName string)

// DropIndex drops an index from the table.
// Returns an error if the index does not exist.
func (t *TableMetadata) DropIndex(indexName string) error {
	// Check if index exists
	if t.GetIndex(indexName) == nil {
		return errors.Errorf("index %q does not exist in table %q", indexName, t.proto.Name)
	}

	// Remove from internal map
	indexID := normalizeNameByCaseSensitivity(indexName, t.isDetailCaseSensitive)
	delete(t.internalIndexes, indexID)

	// Remove from proto's index list
	newIndexes := make([]*storepb.IndexMetadata, 0, len(t.proto.Indexes)-1)
	for _, index := range t.proto.Indexes {
		if t.isDetailCaseSensitive {
			if index.Name != indexName {
				newIndexes = append(newIndexes, index)
			}
		} else {
			if !strings.EqualFold(index.Name, indexName) {
				newIndexes = append(newIndexes, index)
			}
		}
	}
	t.proto.Indexes = newIndexes

	return nil
}

// RenameIndex renames an index in the table.
// Returns an error if the old index doesn't exist or new index already exists.