public static String getCheckSchema(final String schemaName) {
        return new StringBuilder()
                .append("SELECT COUNT(1) FROM INFORMATION_SCHEMA.SCHEMATA ")
                .append(" WHERE SCHEMA_NAME = \'")
                .append(schemaName)
                .append("\';")
                .toString();
    }
Build SQL to check whether the schema exists.

@param schemaName
@return
inlong-manager/manager-service/src/main/java/org/apache/inlong/manager/service/resource/sink/postgresql/PostgreSQLSqlBuilder.java