VECTOR_ NUM_ ELEMENTS
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Return the number of elements in a vector.
It is a scalar function.
Syntax
VECTOR_NUM_ELEMENTS(vector_expression)
Arguments
-
vector_
: An expression that evaluates to a vector.expression The vector must be encoded as a blob containing packed single-precision or double-precision floating-point numbers in little-endian byte order.
Return Type
An integer or a null value.
Remarks
A vector can be of any length, but the input blob length must be divisible by the packed vector element size (1, 2, 4 or 8 bytes, depending on the vector element).
You can specify the datatype of the vector elements in which this operation is performed on the vector by adding a suffix to the function._
.
Suffix |
Datatype |
---|---|
|
8-bit signed integer |
|
16-bit signed integer |
|
32-bit signed integer |
|
64-bit signed integer |
|
32-bit floating-point number (IEEE standard format) |
|
64-bit floating-point number (IEEE standard format) |
Examples
CREATE TABLE vne_t (x BLOB);INSERT INTO vne_t VALUES (JSON_ARRAY_PACK('[4,3,1,5,2]'));
SELECT (VECTOR_NUM_ELEMENTS(x)) AS x from vne_t;
+---+
| x |
+---+
| 5 |
+---+
Last modified: February 28, 2023