June 2018
Beginner to intermediate
210 pages
5h 12m
English
Content preview from Apache Hive Essentials - Second Edition
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Data type conversions
Similar to SQL, HQL supports both implicit and explicit type conversion. Primitive-type conversion from a narrow to a wider type is known as implicit conversion. However, the reverse conversion is not allowed. All the integral numeric types, FLOAT, and STRING can be implicitly converted to DOUBLE, and TINYINT, SMALLINT, and INT can all be converted to FLOAT. BOOLEAN types cannot be converted to any other type. There is a data type cross-table describing the allowed implicit conversion between every two types, which can be found at https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types. Explicit-type conversion uses the CAST function with the CAST(value as TYPE) syntax. For example, CAST('100' as INT)
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