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Starting from 10.5, server shows the variable:
VARIABLE_NAME: OPTIMIZER_MAX_SEL_ARG_WEIGHT
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SESSION_VALUE: 32000
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GLOBAL_VALUE: 32000
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GLOBAL_VALUE_ORIGIN: COMPILE-TIME
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DEFAULT_VALUE: 32000
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VARIABLE_SCOPE: SESSION
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VARIABLE_TYPE: BIGINT UNSIGNED
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VARIABLE_COMMENT: The maximum weight of the SEL_ARG graph. Set to 0 for no limit
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NUMERIC_MIN_VALUE: 0
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NUMERIC_MAX_VALUE: 18446744073709551615
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NUMERIC_BLOCK_SIZE: 1
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ENUM_VALUE_LIST: NULL
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READ_ONLY: NO
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COMMAND_LINE_ARGUMENT: REQUIRED
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GLOBAL_VALUE_PATH: NULL
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but it doesn't seem to be documented in the KB. The description above isn't very helpful either.
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