exec_simple_query('SELECT * FROM t1 WHERE c1 > 10')
    pg_parse_query
    pg_analyze_and_rewrite
        parse_analyze
            transformStmt
                transformSelectStmt
                    transformWhereClause
                        transformExpr
                            transformAExprOp
                                oper
                                    oper_search # 查找操作符所有相关函数
                                    enforce_generic_type_consistency # 根据已知数据类型，找到最符合的函数，自动调用隐式转换
                                make_op
    pg_plan_queries
    PortalRun
        ExecInterpExpr
            ExecEvalExprSwitchContext
                -- ciphera_gt / int4gt