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MySQL 8.4 Reference Manual / ... / Optimization / Tracing the Optimizer / The end_markers_in_json System Variable
When reading a very large JSON document, it can be difficult to pair its closing bracket and opening brackets; settingend_markers_in_json=ON repeats the structure's key, if it has one, near the closing bracket. This variable affects both optimizer traces and the output ofEXPLAIN FORMAT=JSON.
Note
Ifend_markers_in_json is enabled, the repetition of the key means the result is not a valid JSON document, and causes JSON parsers to throw an error.
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