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typedef struct ExplainState
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StringInfo str; /* output buffer */
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bool verbose; /* be verbose */
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bool analyze; /* print actual times */
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bool buffers; /* print buffer usage */
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ExplainFormat format; /* output format */
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PlannedStmt *pstmt; /* top of plan */
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List *rtable; /* range table */
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List *rtable_names; /* alias names for RTEs */
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int indent; /* current indentation level */
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/* Hook for plugins to get control in ExplainOneQuery() */