我们基于 Clickbench 43 个 SQL 进行了测试,如下表可知,Variant 类型与预定义静态列的查询性能差异在 10% 左右;而对于 JSON 类型来说,Variant 类型的查询速度相比于 JSON 类型提升了 8 倍以上(由于 I/O 原因,JSONB 类型的 冷查询大部分超时)。 Variant 的设计实现 01 写入与类型推断 Apache Doris 写入流程...
CREATE DATABASE test_variant; USE test_variant; CREATE TABLE IF NOT EXISTS github_events ( id BIGINT NOT NULL, type VARCHAR(30) NULL, actor VARIANT NULL, repo VARIANT NULL, payload VARIANT NULL, public BOOLEAN NULL, created_at DATETIME NULL, INDEX idx_payload (`payload`) USING INVERTED PR...
sql_variant Remarkssql_variant can be used in columns, parameters, variables, and the return values of user-defined functions. sql_variant enables these database objects to support values of other data types.A column of type sql_variant may contain rows of different data types. For example, ...
Using sql_variant Data The sql_variant data type operates similarly to the variant data type in Microsoft Visual Basic. sql_variant enables a single column, parameter, or variable to store data values of different data types. For example, one sql_variant column can hold int, decimal, char, ...
bit类型存储 0 和 1 ,只需要使用 1 bit 就能表示,但是,在存储到Disk时,SQL Server按照Byte来分配存储空间。如果表中只有1个 bit 列,那么该列将会占用1Byte的空间,一个Byte最多存储8个bit列。 The SQL Server Database Engine optimizes storage ofbit columns. If there are 8 or lessbit columns in a ...
The SQL_VARIANT data type is an interesting beast. It is a data type that can store most types of data. So a date, decimal, int, varchar etc. can be stored in this single data type. This sounds great right? Well there are a few issues here. What data typ
该sql 可以正常执行,但是当把 sql 放到 jdbcTemplate 中执行时报一下错误: Causedby: com.microsoft.sqlserver.jdbc.SQLServerException: The"variant"datatypeisnot supported. 原因是 sql 语句 select 后面有sql_variant类型的属性,在 JDBC 中不支持它。使用sp_columns命令最终查出sys.extended_properties表的value属性...
问使用Sql_Variant时原始数据类型引用EN可以创建用户定义的表类型，将参数数组作为表值参数传递：...
bit类型存储 0 和 1 ,只需要使用 1 bit 就能表示,但是,在存储到Disk时,SQL Server按照Byte来分配存储空间。如果表中只有1个 bit 列,那么该列将会占用1Byte的空间,一个Byte最多存储8个bit列。 The SQL Server Database Engine optimizes storage ofbit columns. If there are 8 or lessbit columns in a ...
This chapter provides tutorial examples and notes about VBScript data type and literal. Topics include what is a Variant; what are data subtypes; data literals for Integer, Long, Single, Double, String, Boolean, and Date.