- Releases Notes and Announcements
- Product Introduction
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- Operation Guide
- SQL Developer Guide
- Python Developer Guide
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- FAQ
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- Releases Notes and Announcements
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- SQL Developer Guide
- Python Developer Guide
- ETL Developer Guide
- FAQ
- Contact Us
Hash functions
Hash functions are described as follows:
Function | Description |
MD5(string) | Returns the MD5 hash (a string of 32 hexadecimal digits) of string. Returns NULL if string is NULL. |
SHA1(string) | Returns the SHA-1 hash (a string of 40 hexadecimal digits) of string. Returns NULL if string is NULL. |
SHA256(string) | Returns the SHA-256 hash (a string of 64 hexadecimal digits) of string. Returns NULL if string is NULL. |
SHA224(string) | Returns the SHA-224 hash (a string of 56 hexadecimal digits) of string. Returns NULL if string is NULL. |
SHA384(string) | Returns the SHA-384 hash (a string of 96 hexadecimal digits) of string. Returns NULL if string is NULL. |
SHA512(string) | Returns the SHA-512 hash (a string of 128 hexadecimal digits) of string. Returns NULL if string is NULL. |
SHA2(string, hashLength) | Returns the hash of string using the SHA-2 family of hash functions. For example, when hashLength is 256, it is equivalent to SHA256(string). |
Value access functions
Value access functions are described as follows:
Function | Description |
tableName.compositeType.field | Returns the value of a field from a composite type (e.g., Tuple, POJO) by name. |
tableName.compositeType.* | Returns the values of all fields from a composite type (e.g., Tuple, POJO). |
Value construction functions
Value construction functions are described as follows:
Function | Description |
(value, [, value]*) ROW(value, [, value]*) | Returns a row created from a list of values. The two expressions are equivalent. |
ARRAY '[' value [, value ] * ']' | Returns an array created from a list of values. |
MAP '[' key, value [, key, value ] * ']' | Returns a map created from a list of key-value pairs. |
Collection functions
Collection functions include array and map operations and are described as follows:
Function | Description |
CARDINALITY(array) | Returns the number of elements in array. |
array '[' index ']' | Returns the element at position index in array. The index starts from 1. |
ELEMENT(array) | Returns the sole element of array (whose cardinality should be one). Returns NULL if array is left empty. Throws an exception if array has more than one element. |
CARDINALITY(map) | Returns the number of entries in map. |
map '[' key ']' | Returns the value specified by key value in map. |
Grouping functions
Grouping functions are used to represent the results of a GROUP BY grouping. They are described as follows:
Function | Description |
GROUP_ID() | Returns an integer that uniquely identifies the combination of grouping keys. |
GROUPING(expression1 [, expression2]* ) GROUPING_ID(expression1 [, expression2]* ) | Returns the group ID (a bit vector) of the given grouping expressions. |
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