mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-01 22:20:50 +00:00
44 lines
1.5 KiB
ReStructuredText
44 lines
1.5 KiB
ReStructuredText
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.
|