Functions for working with external dictionaries

For more information, see the section “External dictionaries”.

dictGetUInt8, dictGetUInt16, dictGetUInt32, dictGetUInt64

dictGetInt8, dictGetInt16, dictGetInt32, dictGetInt64

dictGetFloat32, dictGetFloat64

dictGetDate, dictGetDateTime

dictGetString

dictGetT('dict_name', 'attr_name', id) - Gets the value of the ‘attr_name’ attribute from the ‘dict_name’ dictionary by the ‘id’ key. ‘dict_name’ and ‘attr_name’ are constant strings. ‘id’ must be UInt64. If the ‘id’ key is not in the dictionary, it returns the default value set in the dictionary definition.

dictGetTOrDefault

dictGetT('dict_name', 'attr_name', id, default) Similar to the functions dictGetT, but the default value is taken from the last argument of the function.

dictIsIn

dictIsIn('dict_name', child_id, ancestor_id) - For the ‘dict_name’ hierarchical dictionary, finds out whether the ‘child_id’ key is located inside ‘ancestor_id’ (or matches ‘ancestor_id’). Returns UInt8.

dictGetHierarchy

dictGetHierarchy('dict_name', id) - For the ‘dict_name’ hierarchical dictionary, returns an array of dictionary keys starting from ‘id’ and continuing along the chain of parent elements. Returns Array(UInt64).

dictHas

dictHas('dict_name', id) - check the presence of a key in the dictionary. Returns a value of type UInt8, equal to 0, if there is no key and 1 if there is a key.