Package dev.frostlake.functions.scalar.vector

Class VectorInnerProduct

java.lang.Object
dev.frostlake.functions.BuiltInFunction
dev.frostlake.functions.scalar.vector.VectorInnerProduct
public class VectorInnerProduct extends BuiltInFunction
VECTOR_INNER_PRODUCT(v1, v2) — the dot product Σ(a·b), as a FLOAT (float64).

Live-verified: VECTOR_INNER_PRODUCT([1,2,3], [4,5,6]) is 32.0, and the VECTOR(INT,3) pair gives the same 32.0 with SYSTEM$TYPEOF still FLOAT[DOUBLE] — INT operands do NOT make the result an integer. The product is accumulated in float64 over the 32-bit elements: [0.1,0.2,0.3]·[0.4,0.5,0.6] is 0.32000001698732405, and [2147483647,0,0]·[2,0,0] is 4.294967294E9 rather than overflowing.

  • Constructor Details

    • VectorInnerProduct

      public VectorInnerProduct()

  • Method Details

    • evaluate

      public Object evaluate(List<Object> args)
      Description copied from class: BuiltInFunction
      Computes the function's result over its already-evaluated argument values. A SQL NULL argument arrives as Java null, and returning null makes the SQL result NULL.
      Specified by:
      evaluate in class BuiltInFunction
      Parameters:
      args - the argument values, in call order
      Returns:
      the function's value for these arguments, or null for SQL NULL

    • getMinArgCount

      public int getMinArgCount()
      Description copied from class: BuiltInFunction
      The fewest arguments a call to this function may pass; fewer is an argument-count error.
      Specified by:
      getMinArgCount in class BuiltInFunction
      Returns:
      the minimum accepted argument count

    • getMaxArgCount

      public int getMaxArgCount()
      Description copied from class: BuiltInFunction
      The most arguments a call to this function may pass; Integer.MAX_VALUE marks a variadic function (see BuiltInFunction.isVariadic()).
      Specified by:
      getMaxArgCount in class BuiltInFunction
      Returns:
      the maximum accepted argument count