Bitwise-Comparison Operators
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Bitwise-comparison operators are also available in addition to the traditional relational operators. The AllOf (^a) and SomeOf (^s) operators allow property values to be compared against bit pattern on a bit-by-bit basis. The following table gives an example of each bitwise-comparison operator.
| Operator | Example | Note |
|---|---|---|
| ^a | @attrib^a 0x820 | Specifies compressed documents that have the archive bit attribute on. |
| ^s | @attrib^s 0x20 | Specifies any documents that have the archived bit set on. |
The AllOf and SomeOf operators can be used in conjunction with the relational operators when performing vector property comparisons. When using the ^a operator, every vector element on the left side must pass the comparison against every vector element on the right side. When using the ^s operator, at least one of the vector elements must match the comparison for the test to pass.
The following table illustrates what happens with the comparison of two vectors with different numbers of elements.
| Test | Result | Note |
|---|---|---|
| (1; 2; 3)^a>(1; 2) | FAILS | (1; 2; 3)>(1; 2) normally passes. However, when ^a is specified, the test fails since the first element on the left side is less than the second element on the right side. |
| (1; 2; 3)^s>(2; 1) | PASSES | (1; 2; 3)>(2; 1) normally fails. However, when ^s is specified, the test passes because the third element on the left side is greater than the first element on the right side. |