![]() You can't directly compare a field of type Edm.GeographyPoint with a constant value, but you can use the geo.distance function. In summary, NaN is not equal to any value, including itself. Azure Cognitive Search implements the IEEE 754 standard for handling NaN values, and comparisons with such values produce non-obvious results, as shown in the following table. If your index has fields of type Edm.Double and you upload NaN values to those fields, you will need to account for that when writing filters. ![]() In summary, null is equal only to itself, and is not less or greater than any other value. Result when both the field or variable and the constant are null Result when only the field or variable is null The following table shows all the possible outcomes for a comparison expression where either side can be null: Operator When using comparison operators, it's important to remember that all non-collection fields in Azure Cognitive Search can potentially be null. This is especially important when mixing floating-point and integer values, where implicit conversions that lose precision are possible. Variable or function typeĬomparison is subject to special rules for NaNĬonstant is converted to Edm.Double, resulting in a loss of precision for values of large magnitudeĬomparisons to NaN, -INF, or INF are not allowedĬonstant is converted to Edm.Int64 before comparisonįor comparisons that are not allowed, such as comparing a field of type Edm.Int64 to NaN, the Azure Cognitive Search REST API will return an "HTTP 400: Bad Request" error.Įven though numeric type comparisons are flexible, we highly recommend writing comparisons in filters so that the constant value is of the same data type as the variable or function to which it is being compared. You can compare variables and functions of any numeric type with constants of any other numeric type, with a few limitations, as described in the following table. For example, if the left side is a field of type Edm.DateTimeOffset, then the right side must be a date-time constant. ![]() The data types on both sides of a comparison operator must be compatible. A variable can be either a field name, or a range variable in the case of a lambda expression. The expression on the other side of the operator must be a variable or a function call. The only difference between them is whether the constant appears on the left- or right-hand-side of the operator. There are two forms of comparison expressions. There are numerous conditional jump instructions depending upon the condition and data.See OData expression syntax reference for Azure Cognitive Search for the complete EBNF. If some specified condition is satisfied in conditional jump, the control flow is transferred to a target instruction. SHL CX, 1 shift left CX, this in turn doubles the CX value The following code snippet illustrates the JMP instruction − The JMP instruction provides a label name where the flow of control is transferred immediately. Transfer of control may be forward, to execute a new set of instructions or backward, to re-execute the same steps. Conditional execution often involves a transfer of control to the address of an instruction that does not follow the currently executing instruction. JLE LP1 If it is less than or equal to 10, then jump to LP1Īs mentioned earlier, this is performed by the JMP instruction. Consider the following typical condition −ĬMPĞDX, 10 Compares whether the counter has reached 10 ExampleĬMP DX,Đ0 Compare the DX value with zeroĬMP is often used for comparing whether a counter value has reached the number of times a loop needs to be run. ![]() The source operand could be a constant (immediate) data, register or memory. The destination operand could be either in register or in memory. SyntaxĬMP compares two numeric data fields. It is used along with the conditional jump instruction for decision making. It does not disturb the destination or source operands. ![]() This instruction basically subtracts one operand from the other for comparing whether the operands are equal or not. It is generally used in conditional execution. The CMP instruction compares two operands. Let us discuss the CMP instruction before discussing the conditional instructions. The conditional instructions transfer the control by breaking the sequential flow and they do it by changing the offset value in IP. This is performed by a set of jump instructions j depending upon the condition. This is performed by the JMP instruction. ![]()
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