-- Conversion of main primitive types to String type: 
SELECT CAST(NULL AS STRING) FROM src LIMIT 1;

SELECT CAST(TRUE AS STRING) FROM src LIMIT 1;

SELECT CAST(CAST(1 AS TINYINT) AS STRING) FROM src LIMIT 1;
SELECT CAST(CAST(-18 AS SMALLINT) AS STRING) FROM src LIMIT 1;
SELECT CAST(-129 AS STRING) FROM src LIMIT 1;
SELECT CAST(CAST(-1025 AS BIGINT) AS STRING) FROM src LIMIT 1;

SELECT CAST(CAST(-3.14 AS DOUBLE) AS STRING) FROM src LIMIT 1;
SELECT CAST(CAST(-3.14 AS FLOAT) AS STRING) FROM src LIMIT 1;
SELECT CAST(CAST(-3.14 AS DECIMAL) AS STRING) FROM src LIMIT 1;

SELECT CAST('Foo' AS STRING) FROM src LIMIT 1;