Error 1923: At least one of the 'in_to_exists' or 'materialization' optimizer_switch flags must be '

Error Code	SQLSTATE	Error	Description
1923		ER_ILLEGAL_SUBQUERY_OPTIMIZER_SWITCHES	At least one of the 'in_to_exists' or 'materialization' optimizer_switch flags must be 'on'.

Possible Causes and Solutions

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