这也是为什么执行计划中出现INTERNAL_FUNCTION的原因-从实际的“二进制”执行计划生成可读性的执行计划的代码无法将内部操作码转换为相应的适合人们容易理解的函数名称,因此默认使用“INTERNAL_FUNCTION”字符串取而代之显示。
但是笔者测试验证发现,有时候,执行计划中出现INTERNAL_FUNCTION,并不一定代表出现了隐式数据类型转换,下面我们结合这篇博客“What the heck is the INTERNAL_FUNCTION in execution plan predicate section?”来讲述一下执行计划谓词部分中的INTERNAL_FUNCTION到底是什么?这篇博客没有打算直接翻译这篇文章,而是想结合自己的...
Sometimes,the columns are decrypted as a result and decrypt functions (appears as INTERNAL_FUNCTION in the execution plan) are applied on them, which can lead to poor approximations of column selectivity, leading to improper plans. This happens mostly when the encrypted columns are using SALT to ...
Sometimes,the columns are decrypted as a result and decrypt functions (appears as INTERNAL_FUNCTION in the execution plan) are applied on them, which can lead to poor approximations of column selectivity, leading to improper plans. This happens mostly when the encrypted columns are using SALT to ...
6.2 date类型的字段,谓词条件变量类型是timestamp类型: cdate>=:b1 (b1 类型是timestamp);这种情况,oracle需要将cdate通过内部函数(internal_function)转换成timestamp类型,导致无法使用cdate字段上的正常索引。应对方法:只能通过修改代码,将变量类型从timestamp改成date,或者将字段类型从date改成timestamp,不能通过创...
(identifiedbyoperation id):---" 1 - filter(""RN""=1)"" 2 - filter(ROW_NUMBER() OVER ( PARTITION BY ""SB"".""STU_CLASSID"",""SB"".""STU_AGE"",""SB"".""STU_SEX"" ORDER BY INTERNAL_FUNCTION(""SB"".""STU_DATE"") DESC ")<=1) KingBase 执行计划 sql QUERY PLAN---...
函数(Function)为一命名的存储程序,可带参数,并返回一计算值; 函数和过程的结构类似,但必须有一个return子句,用于返回函数值。 创建存储函数的语法 代码语言:javascript 代码运行次数:0 运行 AI代码解释 create[or replace]function函数名(参数列表)return函数值类型asPLSQL子程序体; ...
gsql:Oracle_Functions.sql:1035: NOTICE: | aggregate | wm_concat(text) | 1.0 | internal | Skip due to version | gsql:Oracle_Functions.sql:1035: NOTICE: | function | nvl2(anyelement,anyelement,anyelement) | 1.0 | sql | Skip due to version | ...
ORA-17044 Internal error: Data array not allocated 内部错误: 未分配数据数组。 ORA-17045 Internal error: Attempt to access bind values beyond the batch value 内部错误: 试图访问批值之外的绑定值。 ORA-17046 Internal error: Invalid index for data access 内部错误: 数据访问的索引无效。 ORA-17047 Er...
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