dequantize

Signed-off-by: usamoi <usamoi@outlook.com>

Author: usamoi

src/vectorchord/usage/quantization-types.md

@@ -66,6 +66,26 @@ Refer to
     - `SELECT quantize_to_rabitq8('[1,1,1]'::halfvec)`
 - Note: This function does not have a corresponding `CAST`. If you really need one, you can create it by `CREATE CAST (halfvec AS rabitq8) WITH FUNCTION quantize_to_rabitq8(halfvec) AS ASSIGNMENT`.
 
+#### `dequantize_to_vector(rabitq8)` <badge type="tip" text="since v1.1.1" />
+
+- Description: Dequantize a quantized vector to `vector`. This function may produce different outputs for the same input with different versions of VectorChord or with different machines. The original vector cannot be precisely reconstructed using this function.
+- Result: `vector`, the dequantized vector
+- Arguments:
+    - `rabitq8`, the quantized vector to be dequantized
+- Example:
+    - `SELECT dequantize_to_vector(quantize_to_rabitq8('[1,1,1]'::vector))`
+- Note: This function does not have a corresponding `CAST`. If you really need one, you can create it by `CREATE CAST (rabitq8 AS vector) WITH FUNCTION dequantize_to_vector(rabitq8) AS ASSIGNMENT`.
+
+#### `dequantize_to_halfvec(rabitq8)` <badge type="tip" text="since v1.1.1" />
+
+- Description: Dequantize a quantized vector to `halfvec`. This function may produce different outputs for the same input with different versions of VectorChord or with different machines. The original vector cannot be precisely reconstructed using this function.
+- Result: `halfvec`, the dequantized vector
+- Arguments:
+    - `rabitq8`, the quantized vector to be dequantized
+- Example:
+    - `SELECT dequantize_to_halfvec(quantize_to_rabitq8('[1,1,1]'::halfvec))`
+- Note: This function does not have a corresponding `CAST`. If you really need one, you can create it by `CREATE CAST (rabitq8 AS halfvec) WITH FUNCTION dequantize_to_halfvec(rabitq8) AS ASSIGNMENT`.
+
 #### `quantize_to_rabitq4(vector)` <badge type="tip" text="since v1.1.0" />
 
 - Description: Quantize a vector to `rabitq4`. This function may produce different outputs for the same input with different versions of VectorChord or with different machines.
@@ -86,6 +106,26 @@ Refer to
     - `SELECT quantize_to_rabitq4('[1,1,1]'::halfvec)`
 - Note: This function does not have a corresponding `CAST`. If you really need one, you can create it by `CREATE CAST (halfvec AS rabitq4) WITH FUNCTION quantize_to_rabitq4(halfvec) AS ASSIGNMENT`.
 
+#### `dequantize_to_vector(rabitq4)` <badge type="tip" text="since v1.1.1" />
+
+- Description: Dequantize a quantized vector to `vector`. This function may produce different outputs for the same input with different versions of VectorChord or with different machines. The original vector cannot be precisely reconstructed using this function.
+- Result: `vector`, the dequantized vector
+- Arguments:
+    - `rabitq4`, the quantized vector to be dequantized
+- Example:
+    - `SELECT dequantize_to_vector(quantize_to_rabitq4('[1,1,1]'::vector))`
+- Note: This function does not have a corresponding `CAST`. If you really need one, you can create it by `CREATE CAST (rabitq4 AS vector) WITH FUNCTION dequantize_to_vector(rabitq4) AS ASSIGNMENT`.
+
+#### `dequantize_to_halfvec(rabitq4)` <badge type="tip" text="since v1.1.1" />
+
+- Description: Dequantize a quantized vector to `halfvec`. This function may produce different outputs for the same input with different versions of VectorChord or with different machines. The original vector cannot be precisely reconstructed using this function.
+- Result: `halfvec`, the dequantized vector
+- Arguments:
+    - `rabitq4`, the quantized vector to be dequantized
+- Example:
+    - `SELECT dequantize_to_halfvec(quantize_to_rabitq4('[1,1,1]'::halfvec))`
+- Note: This function does not have a corresponding `CAST`. If you really need one, you can create it by `CREATE CAST (rabitq4 AS halfvec) WITH FUNCTION dequantize_to_halfvec(rabitq4) AS ASSIGNMENT`.
+
 ### Operators
 
 #### `<->(rabitq8, rabitq8)` <badge type="tip" text="since v1.1.0" />