This content originally appeared on DEV Community and was authored by Cong Li
Bitwise Function Usage Guide
GBase 8a MPP Cluster uses the BIGINT (64-bit) algorithm for bitwise operations. Therefore, the maximum valid range for these operators is 64 bits.
Note: Bitwise operations only support numerical types.
1. | (Bitwise OR)
Example
Returns the result of 29 | 15.
gbase> SELECT 29 | 15 FROM dual;
+---------+
| 29 | 15 |
+---------+
| 31 |
+---------+
1 row in set
Explanation: The bit value of 29 is 11101, and the bit value of 15 is 1111. Performing a bitwise OR operation results in 11111, which corresponds to the decimal value 31.
2. & (Bitwise AND)
Example
Returns the result of 29 & 15.
gbase> SELECT 29 & 15 FROM dual;
+---------+
| 29 & 15 |
+---------+
| 13 |
+---------+
1 row in set
Explanation: The bit value of 29 is 11101, and that of 15 is 1111. Performing a bitwise AND operation results in 1101, which corresponds to the decimal value 13.
3. ^ (Bitwise XOR)
Examples
Example 1: Returns the result of 1 ^ 1.
gbase> SELECT 1 ^ 1 FROM dual;
+-------+
| 1 ^ 1 |
+-------+
| 0 |
+-------+
1 row in set
Example 2: Returns the result of 1 ^ 0.
gbase> SELECT 1 ^ 0 FROM dual;
+-------+
| 1 ^ 0 |
+-------+
| 1 |
+-------+
1 row in set
Example 3: Returns the result of 11 ^ 3.
gbase> SELECT 11 ^ 3 FROM dual;
+--------+
| 11 ^ 3 |
+--------+
| 8 |
+--------+
1 row in set
Explanation: The bit value of 11 is 1011, and that of 3 is 0011. Performing a bitwise XOR operation results in 1000, which corresponds to the decimal value 8.
4. << (Left Shift - BIGINT)
Example
Returns the result of 1 << 2.
gbase> SELECT 1 << 2 FROM dual;
+--------+
| 1 << 2 |
+--------+
| 4 |
+--------+
1 row in set
Explanation: The bit value of 1 is 0001. Shifting two positions to the left results in 0100, which corresponds to the decimal value 4.
5. >> (Right Shift - BIGINT)
Example
Returns the result of 4 >> 2.
gbase> SELECT 4 >> 2 FROM dual;
+--------+
| 4 >> 2 |
+--------+
| 1 |
+--------+
1 row in set
Explanation: The bit value of 4 is 0100. Shifting two positions to the right results in 0001, which corresponds to the decimal value 1.
6. BIT_COUNT(N)
Function Description: Returns the total number of bits set to 1 in the parameter N.
Example
Returns the number of bits set to 1 in 29.
gbase> SELECT BIT_COUNT(29) FROM dual;
+---------------+
| BIT_COUNT(29) |
+---------------+
| 4 |
+---------------+
1 row in set
Explanation: The bit value of 29 is 11101, and the number of bits set to 1 is 4.
These are the main bitwise functions in GBase 8a MPP Cluster. Thank you for reading!
This content originally appeared on DEV Community and was authored by Cong Li
Cong Li | Sciencx (2024-09-05T02:32:25+00:00) Introduction to Bitwise Functions in GBase 8a MPP Cluster. Retrieved from https://www.scien.cx/2024/09/05/introduction-to-bitwise-functions-in-gbase-8a-mpp-cluster/
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