1 | #pragma once |
2 | |
3 | #include <Core/Field.h> |
4 | #include <DataTypes/IDataType.h> |
5 | #include <IO/ReadBufferFromString.h> |
6 | #include <Interpreters/IExternalLoadable.h> |
7 | #include <Poco/Util/AbstractConfiguration.h> |
8 | |
9 | #include <map> |
10 | #include <optional> |
11 | #include <string> |
12 | #include <vector> |
13 | |
14 | |
15 | namespace DB |
16 | { |
17 | |
18 | namespace ErrorCodes |
19 | { |
20 | extern const int TYPE_MISMATCH; |
21 | } |
22 | |
23 | enum class AttributeUnderlyingType |
24 | { |
25 | utUInt8, |
26 | utUInt16, |
27 | utUInt32, |
28 | utUInt64, |
29 | utUInt128, |
30 | utInt8, |
31 | utInt16, |
32 | utInt32, |
33 | utInt64, |
34 | utFloat32, |
35 | utFloat64, |
36 | utDecimal32, |
37 | utDecimal64, |
38 | utDecimal128, |
39 | utString |
40 | }; |
41 | |
42 | |
43 | AttributeUnderlyingType getAttributeUnderlyingType(const std::string & type); |
44 | |
45 | std::string toString(const AttributeUnderlyingType type); |
46 | |
47 | /// Implicit conversions in dictGet functions is disabled. |
48 | inline void checkAttributeType(const std::string & dict_name, const std::string & attribute_name, |
49 | AttributeUnderlyingType attribute_type, AttributeUnderlyingType to) |
50 | { |
51 | if (attribute_type != to) |
52 | throw Exception{dict_name + ": type mismatch: attribute " + attribute_name + " has type " + toString(attribute_type) |
53 | + ", expected " + toString(to), ErrorCodes::TYPE_MISMATCH}; |
54 | } |
55 | |
56 | /// Min and max lifetimes for a dictionary or it's entry |
57 | using DictionaryLifetime = ExternalLoadableLifetime; |
58 | |
59 | |
60 | /** Holds the description of a single dictionary attribute: |
61 | * - name, used for lookup into dictionary and source; |
62 | * - type, used in conjunction with DataTypeFactory and getAttributeUnderlyingTypeByname; |
63 | * - null_value, used as a default value for non-existent entries in the dictionary, |
64 | * decimal representation for numeric attributes; |
65 | * - hierarchical, whether this attribute defines a hierarchy; |
66 | * - injective, whether the mapping to parent is injective (can be used for optimization of GROUP BY?) |
67 | * - is_object_id, used in mongo dictionary, converts string key to objectid |
68 | */ |
69 | struct DictionaryAttribute final |
70 | { |
71 | const std::string name; |
72 | const AttributeUnderlyingType underlying_type; |
73 | const DataTypePtr type; |
74 | const std::string expression; |
75 | const Field null_value; |
76 | const bool hierarchical; |
77 | const bool injective; |
78 | const bool is_object_id; |
79 | }; |
80 | |
81 | |
82 | struct DictionarySpecialAttribute final |
83 | { |
84 | const std::string name; |
85 | const std::string expression; |
86 | |
87 | DictionarySpecialAttribute(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix); |
88 | }; |
89 | |
90 | struct DictionaryTypedSpecialAttribute final |
91 | { |
92 | const std::string name; |
93 | const std::string expression; |
94 | const DataTypePtr type; |
95 | }; |
96 | |
97 | |
98 | /// Name of identifier plus list of attributes |
99 | struct DictionaryStructure final |
100 | { |
101 | std::optional<DictionarySpecialAttribute> id; |
102 | std::optional<std::vector<DictionaryAttribute>> key; |
103 | std::vector<DictionaryAttribute> attributes; |
104 | std::optional<DictionaryTypedSpecialAttribute> range_min; |
105 | std::optional<DictionaryTypedSpecialAttribute> range_max; |
106 | bool has_expressions = false; |
107 | |
108 | DictionaryStructure(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix); |
109 | |
110 | void validateKeyTypes(const DataTypes & key_types) const; |
111 | std::string getKeyDescription() const; |
112 | bool isKeySizeFixed() const; |
113 | size_t getKeySize() const; |
114 | |
115 | private: |
116 | std::vector<DictionaryAttribute> getAttributes( |
117 | const Poco::Util::AbstractConfiguration & config, |
118 | const std::string & config_prefix, |
119 | const bool hierarchy_allowed = true, |
120 | const bool allow_null_values = true); |
121 | }; |
122 | |
123 | } |
124 | |