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Add isValidJSON function

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This commit is contained in:
VDimir 2019-10-12 11:42:43 +00:00
parent aeb7504570
commit 1174fc346b
4 changed files with 30 additions and 3 deletions
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1
dbms/src/Functions/FunctionsJSON.cpp
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@ -8,6 +8,7 @@ namespace DB
void registerFunctionsJSON(FunctionFactory & factory)
{
factory.registerFunction<FunctionJSON<NameJSONHas, JSONHasImpl>>();
factory.registerFunction<FunctionJSON<NameIsValidJSON, isValidJSONImpl>>();
factory.registerFunction<FunctionJSON<NameJSONLength, JSONLengthImpl>>();
factory.registerFunction<FunctionJSON<NameJSONKey, JSONKeyImpl>>();
factory.registerFunction<FunctionJSON<NameJSONType, JSONTypeImpl>>();

23
dbms/src/Functions/FunctionsJSON.h
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@ -279,6 +279,7 @@ private:
struct NameJSONHas { static constexpr auto name{"JSONHas"}; };
struct NameIsValidJSON { static constexpr auto name{"isValidJSON"}; };
struct NameJSONLength { static constexpr auto name{"JSONLength"}; };
struct NameJSONKey { static constexpr auto name{"JSONKey"}; };
struct NameJSONType { static constexpr auto name{"JSONType"}; };
@ -292,11 +293,23 @@ struct NameJSONExtractKeysAndValues { static constexpr auto name{"JSONExtractKey
struct NameJSONExtractRaw { static constexpr auto name{"JSONExtractRaw"}; };
template <typename JSONParser>
class JSONHasImpl
template <typename JSONParser, bool support_key_lookup>
class JSONCheckImpl
{
public:
static DataTypePtr getType(const char *, const ColumnsWithTypeAndName &) { return std::make_shared<DataTypeUInt8>(); }
static DataTypePtr getType(const char * function_name, const ColumnsWithTypeAndName & arguments) {
if constexpr (!support_key_lookup) {
if (arguments.size() != 1)
throw Exception{"Function " + String(function_name) + " needs exactly one argument",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH};
}
else
{
UNUSED(function_name);
UNUSED(arguments);
}
return std::make_shared<DataTypeUInt8>();
}
using Iterator = typename JSONParser::Iterator;
static bool addValueToColumn(IColumn & dest, const Iterator &)
@ -310,6 +323,10 @@ public:
static void prepare(const char *, const Block &, const ColumnNumbers &, size_t) {}
};
template <typename JSONParser>
using JSONHasImpl = JSONCheckImpl<JSONParser, true>;
template <typename JSONParser>
using isValidJSONImpl = JSONCheckImpl<JSONParser, false>;
template <typename JSONParser>
class JSONLengthImpl

4
dbms/tests/queries/0_stateless/00918_json_functions.reference
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@ -7,6 +7,10 @@
1
1
0
--isValidJSON--
1
0
0
--JSONKey--
a
b

5
dbms/tests/queries/0_stateless/00918_json_functions.sql
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@ -11,6 +11,11 @@ SELECT JSONHas('{"a": "hello", "b": [-100, 200.0, 300]}', 'a');
SELECT JSONHas('{"a": "hello", "b": [-100, 200.0, 300]}', 'b');
SELECT JSONHas('{"a": "hello", "b": [-100, 200.0, 300]}', 'c');
SELECT '--isValidJSON--';
SELECT isValidJSON('{"a": "hello", "b": [-100, 200.0, 300]}');
SELECT isValidJSON('not a json');
SELECT isValidJSON('"HX-=');
SELECT '--JSONKey--';
SELECT JSONKey('{"a": "hello", "b": [-100, 200.0, 300]}', 1);
SELECT JSONKey('{"a": "hello", "b": [-100, 200.0, 300]}', 2);