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Hive convert string to boolean11/7/2023 ![]() If you look at the table properties in both Apache Hive and Impala, the following will be displayed. INSERT INTO Customers VALUES(400, ‘Maddy’, false) INSERT INTO Customers VALUES(300, ‘Julia’, true) INSERT INTO Customers VALUES(200, ‘Kate’, false) For binary, it will store base64 encoded value. INSERT INTO Customers VALUES(100, ‘John’, true) CREATE TABLE allbinarytypes( cboolean boolean, cbinary binary ) Sample data: insert into allbinarytypes values (0,1234) insert into allbinarytypes values (1,4321) Note: For boolean, internally it stored as true or false. The below data has been inserted through Impala-shell. Boolean values are true and false, besides these, if you try to convert any other value to boolean cast() function returns true by default. In the above example, the column ActiveStatus is assigned with BOOLEAN data type. In PySpark, you can cast or change the DataFrame column data type using cast() function of Column class, in this article, I will be using withColumn(), selectExpr(), and SQL expression to cast the from String to Int (Integer Type), String to Boolean e.t.c using PySpark examples. Note that casting floating String to Decimal rounds the value to closest integer value. Let’s see how to implement Boolean data type in Apache Hive and Apache Impala. In PostgreSQL, Apache Hive and Apache Impala, we have BOOLEAN data type that accept TRUE or FALSE values. In SQL Server and MySQL, we use BIT data type that accepts 1 or 0. We use NUMBER(1) in Oracle to store Boolean values. ![]() Boolean data type is a data type that has one of two possible values (usually true and false) meant to represent the two true values of logic and boolean algebra. let boolString 'true' let boolValue (boolString 'true') console.log(boolValue) // true. If both values are the same, it will return the boolean value true, otherwise, it will return the boolean value false. The BOOLEAN data type is named after him. In this case, you want to convert a string to a boolean, which means you'll compare it to the string 'true'. George Boole described an algebraic logic system in the mid-19th century. ![]()
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