mirror of
https://github.com/GreptimeTeam/greptimedb.git
synced 2026-08-24 23:18:25 +00:00
dennis zhuang
4dd92c774e
* feat: add json_object scalar function Builds a JSONB object from interleaved (key, value, ...) arguments, like MySQL's JSON_OBJECT. Values are written into the binary directly, so JSON-hostile characters (quotes, backslashes, control characters) need no text-level escaping. Keys must be non-NULL strings; values may be strings, numbers, booleans, or NULL (JSON null). Signed-off-by: Dennis Zhuang <killme2008@gmail.com> * fix: build entity-graph JSON objects with json_object The derivation assembled entity_id_attrs and descriptive by concatenating a JSON text and parsing it, escaping only backslash and double quote in runtime values. A label containing a control character (e.g. a newline) produced unparseable text and failed the whole semantic_entities scan instead of one attribute. json_object assembles the JSONB binary directly from the value columns, so no text escaping is involved; NULL-to-'' stays at the call site. Signed-off-by: Dennis Zhuang <killme2008@gmail.com> * chore: trim comments and fold duplicate test coverage Signed-off-by: Dennis Zhuang <killme2008@gmail.com> * fix: json_object() returns an empty object; narrow values to integers and floats MySQL's JSON_OBJECT allows an empty pair list, so the signature accepts zero arguments and the row count falls back to number_rows. Decimals stay rejected instead of casting to Float64: JSONB numbers (i64/u64/f64) cannot represent them exactly and a silent precision loss is worse than an explicit cast. Signed-off-by: Dennis Zhuang <killme2008@gmail.com> * chore: document key-to-string conversion and align test naming Keys follow MySQL JSON_OBJECT: any castable type is converted to string. Rustdoc and the cast-failure message now say so, with a numeric-key test. Test names take the module-conventional test_ prefix. Signed-off-by: Dennis Zhuang <killme2008@gmail.com> --------- Signed-off-by: Dennis Zhuang <killme2008@gmail.com>
65 lines
1.8 KiB
SQL
65 lines
1.8 KiB
SQL
--- json_object_keys ---
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SELECT json_object_keys(parse_json('{"a": 1, "b": {"c": 2}}'));
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SELECT json_object_keys(parse_json('{}'));
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SELECT json_object_keys(parse_json('[1, 2]'));
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SELECT json_object_keys(parse_json('null'));
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SELECT json_object_keys(NULL);
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--- json_path_exists ---
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SELECT json_path_exists(parse_json('{"a": 1, "b": 2}'), '$.a');
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SELECT json_path_exists(parse_json('{"a": 1, "b": 2}'), '$.c');
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SELECT json_path_exists(parse_json('[1, 2]'), '[0]');
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SELECT json_path_exists(parse_json('[1, 2]'), '[2]');
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SELECT json_path_exists(parse_json('[1, 2]'), 'null');
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SELECT json_path_exists(parse_json('null'), '$.a');
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SELECT json_path_exists(NULL, '$.a');
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SELECT json_path_exists(parse_json('{}'), NULL);
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--- json_path_match ---
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SELECT json_path_match(parse_json('{"a": 1, "b": 2}'), '$.a == 1');
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SELECT json_path_match(parse_json('{"a":1,"b":[1,2,3]}'), '$.b[0] > 1');
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SELECT json_path_match(parse_json('{"a":1,"b":[1,2,3]}'), '$.b[1 to last] >= 2');
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SELECT json_path_match(parse_json('{"a":1,"b":[1,2,3]}'), 'null');
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SELECT json_path_match(parse_json('null'), '$.a == 1');
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--- json_object ---
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SELECT json_to_string(json_object('a', 1, 'b', 'text', 'c', true, 'd', 1.5));
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SELECT json_to_string(json_object());
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SELECT json_to_string(json_object('nul', NULL));
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SELECT json_to_string(json_object('nl', concat('line1', chr(10), 'line2'), 'q', 'quote"back\slash'));
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SELECT json_object('a');
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SELECT json_object(NULL, 1);
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SELECT json_object('ts', to_timestamp(0));
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SELECT json_object('price', CAST('12.34' AS DECIMAL(10, 2)));
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CREATE TABLE json_object_src (ts TIMESTAMP TIME INDEX, host STRING, pid BIGINT);
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INSERT INTO json_object_src VALUES (0, 'h1', 42), (1, NULL, 7);
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SELECT json_to_string(json_object('host', host, 'pid', pid)) FROM json_object_src ORDER BY ts;
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DROP TABLE json_object_src;
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