Package org.h2.expression.condition

Class ConditionInConstantSet

java.lang.Object
org.h2.expression.Expression
org.h2.expression.condition.Condition
org.h2.expression.condition.ConditionInConstantSet
All Implemented Interfaces:
HasSQL, Typed
public final class ConditionInConstantSet extends Condition
Used for optimised IN(...) queries where the contents of the IN list are all constant and of the same type.

  • Field Details

    • left

      private Expression left

    • not

      private final boolean not

    • whenOperand

      private final boolean whenOperand

    • valueList

      private final ArrayList<Expression> valueList

    • valueSet

      private final TreeSet<Value> valueSet

    • hasNull

      private boolean hasNull

    • type

      private final TypeInfo type

  • Constructor Details

    • ConditionInConstantSet

      ConditionInConstantSet(SessionLocal session, Expression left, boolean not, boolean whenOperand, ArrayList<Expression> valueList)
      Create a new IN(..) condition.
      Parameters:
      session - the session
      left - the expression before IN. Cannot have Value.UNKNOWN data type and Value.ENUM type is also supported only for ExpressionColumn.
      not - whether the result should be negated
      whenOperand - whether this is a when operand
      valueList - the value list (at least two elements); all values must be comparable with left value

  • Method Details

    • add

      private void add(Value v, SessionLocal session)

    • getValue

      public Value getValue(SessionLocal session)
      Description copied from class: Expression
      Return the resulting value for the current row.
      Specified by:
      getValue in class Expression
      Parameters:
      session - the session
      Returns:
      the result

    • getWhenValue

      public boolean getWhenValue(SessionLocal session, Value left)
      Description copied from class: Expression
      Return the resulting value of when operand for the current row.
      Overrides:
      getWhenValue in class Expression
      Parameters:
      session - the session
      left - value on the left side
      Returns:
      the result

    • getValue

      private Value getValue(Value left, SessionLocal session)

    • isWhenConditionOperand

      public boolean isWhenConditionOperand()
      Description copied from class: Expression
      Returns whether this expression is a right side of condition in a when operand.
      Overrides:
      isWhenConditionOperand in class Expression
      Returns:
      true if it is, false otherwise

    • mapColumns

      public void mapColumns(ColumnResolver resolver, int level, int state)
      Description copied from class: Expression
      Map the columns of the resolver to expression columns.
      Specified by:
      mapColumns in class Expression
      Parameters:
      resolver - the column resolver
      level - the subquery nesting level
      state - current state for nesting checks, initial value is Expression.MAP_INITIAL

    • optimize

      public Expression optimize(SessionLocal session)
      Description copied from class: Expression
      Try to optimize the expression.
      Specified by:
      optimize in class Expression
      Parameters:
      session - the session
      Returns:
      the optimized expression

    • getNotIfPossible

      public Expression getNotIfPossible(SessionLocal session)
      Description copied from class: Expression
      If it is possible, return the negated expression. This is used to optimize NOT expressions: NOT ID>10 can be converted to ID<=10. Returns null if negating is not possible.
      Overrides:
      getNotIfPossible in class Expression
      Parameters:
      session - the session
      Returns:
      the negated expression, or null

    • createIndexConditions

      public void createIndexConditions(SessionLocal session, TableFilter filter)
      Description copied from class: Expression
      Create index conditions if possible and attach them to the table filter.
      Overrides:
      createIndexConditions in class Expression
      Parameters:
      session - the session
      filter - the table filter

    • setEvaluatable

      public void setEvaluatable(TableFilter tableFilter, boolean b)
      Description copied from class: Expression
      Tell the expression columns whether the table filter can return values now. This is used when optimizing the query.
      Specified by:
      setEvaluatable in class Expression
      Parameters:
      tableFilter - the table filter
      b - true if the table filter can return value

    • needParentheses

      public boolean needParentheses()
      Description copied from class: Expression
      Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.
      Overrides:
      needParentheses in class Expression
      Returns:
      true if it is

    • getUnenclosedSQL

      public StringBuilder getUnenclosedSQL(StringBuilder builder, int sqlFlags)
      Description copied from class: Expression
      Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.
      Specified by:
      getUnenclosedSQL in class Expression
      Parameters:
      builder - string builder
      sqlFlags - formatting flags
      Returns:
      the specified string builder

    • getWhenSQL

      public StringBuilder getWhenSQL(StringBuilder builder, int sqlFlags)
      Description copied from class: Expression
      Appends the SQL statement of this when operand to the specified builder.
      Overrides:
      getWhenSQL in class Expression
      Parameters:
      builder - string builder
      sqlFlags - formatting flags
      Returns:
      the specified string builder

    • updateAggregate

      public void updateAggregate(SessionLocal session, int stage)
      Description copied from class: Expression
      Update an aggregate value. This method is called at statement execution time. It is usually called once for each row, but if the expression is used multiple times (for example in the column list, and as part of the HAVING expression) it is called multiple times - the row counter needs to be used to make sure the internal state is only updated once.
      Specified by:
      updateAggregate in class Expression
      Parameters:
      session - the session
      stage - select stage

    • isEverything

      public boolean isEverything(ExpressionVisitor visitor)
      Description copied from class: Expression
      Check if this expression and all sub-expressions can fulfill a criteria. If any part returns false, the result is false.
      Specified by:
      isEverything in class Expression
      Parameters:
      visitor - the visitor
      Returns:
      if the criteria can be fulfilled

    • getCost

      public int getCost()
      Description copied from class: Expression
      Estimate the cost to process the expression. Used when optimizing the query, to calculate the query plan with the lowest estimated cost.
      Specified by:
      getCost in class Expression
      Returns:
      the estimated cost

    • getAdditional

      Expression getAdditional(SessionLocal session, Comparison other)
      Add an additional element if possible. Example: given two conditions A IN(1, 2) OR A=3, the constant 3 is added: A IN(1, 2, 3).
      Parameters:
      session - the session
      other - the second condition
      Returns:
      null if the condition was not added, or the new condition

    • getSubexpressionCount

      public int getSubexpressionCount()
      Description copied from class: Expression
      Returns count of subexpressions.
      Overrides:
      getSubexpressionCount in class Expression
      Returns:
      count of subexpressions

    • getSubexpression

      public Expression getSubexpression(int index)
      Description copied from class: Expression
      Returns subexpression with specified index.
      Overrides:
      getSubexpression in class Expression
      Parameters:
      index - 0-based index
      Returns:
      subexpression with specified index, may be null