Module com.darkcollective.relix.ast
Package com.darkcollective.relix.ast

Record Class ScalarSubqueryOperand

java.lang.Object
java.lang.Record
com.darkcollective.relix.ast.ScalarSubqueryOperand
Record Components:
query - the relation whose one value this is; must not be null
location - the source location of the opening parenthesis; never null
All Implemented Interfaces:
Operand
public record ScalarSubqueryOperand(RelNode query, SourceLocation location) extends Record implements Operand
A relation used as a value: (γ COUNT(*) → n (σ customer_id = Customers.customer_id (Orders))).

The relation has one column. Its value is that column's value in its one row, or NULL when it has none; more than one row is an error when the query runs. Inside it, a qualified name whose relation the subquery does not read, Customers.customer_id above, is a column of the row the value is computed for: the subquery is correlated, and yields a value per row.

  • Constructor Details

    • ScalarSubqueryOperand

      public ScalarSubqueryOperand(RelNode query, SourceLocation location)
      Creates an instance of a ScalarSubqueryOperand record class.
      Parameters:
      query - the value for the query record component
      location - the value for the location record component

    • ScalarSubqueryOperand

      public ScalarSubqueryOperand(RelNode query)
      Convenience constructor for tests; uses SourceLocation.UNKNOWN.

  • Method Details

    • accept

      public <R> R accept(OperandVisitor<R> visitor)
      Specified by:
      accept in interface Operand

    • toString

      public final String toString()
      Returns a string representation of this record class. The representation contains the name of the class, followed by the name and value of each of the record components.
      Specified by:
      toString in class Record
      Returns:
      a string representation of this object

    • hashCode

      public final int hashCode()
      Returns a hash code value for this object. The value is derived from the hash code of each of the record components.
      Specified by:
      hashCode in class Record
      Returns:
      a hash code value for this object

    • equals

      public final boolean equals(Object o)
      Indicates whether some other object is "equal to" this one. The objects are equal if the other object is of the same class and if all the record components are equal. All components in this record class are compared with Objects::equals(Object,Object).
      Specified by:
      equals in class Record
      Parameters:
      o - the object with which to compare
      Returns:
      true if this object is the same as the o argument; false otherwise.

    • query

      public RelNode query()
      Returns the value of the query record component.
      Returns:
      the value of the query record component

    • location

      public SourceLocation location()
      Returns the value of the location record component.
      Specified by:
      location in interface Operand
      Returns:
      the value of the location record component