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【DM版本】:DM8(–03134283938-20221019-172201-20018)
【操作系统】：windows 10 64位
【CPU】:i5-10500
【问题描述】*：
【DmProvider】数据库存储char(36)字段值为null返回的却是空字符串（" "）。
版本：DmProvider.1.1.0.11058
现象：

示例代码：

var sql = "SELECT \"CREATEDGUID\"  FROM p_GlobalParam LIMIT 1;";

using (var connection = new DmConnection(s_connectionString))
{
	connection.Open();

	DmCommand cmd = new DmCommand();
	cmd.Connection = connection;
	cmd.CommandText = sql;

	var guidResult = cmd.ExecuteScalar();
	if (guidResult !=null)
		throw new InvalidCastException($"CHAR(36)类型的列值为null，但是查询出来的值为：{guidResult?.ToString()}");
}

初始sql

CREATE TABLE IF NOT EXISTS "p_GlobalParam"
(
"PARAMCODE" VARCHAR(128),
"PARAMVALUE" VARCHAR(128),
"SYSCODE" VARCHAR(128),
"CREATEDGUID" CHAR(36),
"CREATEDNAME" VARCHAR(128),
"CREATEDTIME" TIMESTAMP(0),
"GLOBALPARAMGUID" CHAR(36) NOT NULL,
"MODIFIEDGUID" CHAR(36),
"MODIFIEDNAME" VARCHAR(128),
"MODIFIEDTIME" TIMESTAMP(0),
"VERSIONNUMBER" TIMESTAMP(0) DEFAULT CURRENT_TIMESTAMP()  NOT NULL) STORAGE(ON "MAIN", CLUSTERBTR);

INSERT INTO  "p_globalparam" ("ParamCode", "ParamValue", "SysCode", "CreatedGUID", "CreatedName", "CreatedTime", "GlobalParamGUID", "ModifiedGUID", "ModifiedName", "ModifiedTime", "VersionNumber") 
    VALUES('core', '', 'SSO', NULL, NULL, '2022-01-19 17:33:01', '08d9db2e-af6a-48d4-8c18-0b0fd4e4b4d3', NULL, NULL, NULL, '2022-01-20 01:33:00');