Creates a holder containing null.

Returns an {@link Enumerator} that has no elements. @param <T> Element type @return Empty enumerator

Gets this type's collation, or null if this type cannot carry a collation or has no collation defined. @return collation of type

Returns current implementation chosen for this vertex.

Returns whether an expression is monotonic in this scope. For example, if the scope has previously been sorted by columns X, Y, then X is monotonic in

Creates a {@link HepProgram} with common transitive rules.

Provide a handler for the requested metadata class. @param handlerClass The handler interface expected @param <MH> The metadata type the handler rela

Creates a ConditionalExpression that represents a conditional block with an if statement.

Returns whether this is a simple identifier. "FOO" is simple; " ", "FOO. " and "FOO.BAR" are not.

Creates a reference to a dynamic parameter. @param type Type of dynamic parameter @param index Index of dynamic parameter @return Expression referen

Returns an implementation of {@link RelProtoDataType} that copies a given type using the given type factory.

Whether to simplify expressions; default true.

Filters a sequence of values based on a predicate.

Creates an {@link Aggregate} with an array of calls.

The list of {@link Aggregation}s.

Returns a default {@link Config}.

Returns whether this set contains the given name, with a given case-sensitivity.

Dumps a plan as a string. @param header Header to print before the plan. Ignored if the format is XML @param rel Rela

Ensures expression is interpreted as a specified type. The returned expression may be wrapped with a cast. @param type desired type @para

Finds the most efficient expression to implement this query. @throws CannotPlanException if cannot find a plan

Returns the type of roll-up. @return Type of roll-up

Returns the standard operator table, creating it if necessary.

Registers any special rules specific to this kind of relational expression. <p>The planner calls this method this first time that it sees a relationa

Replaces an existing RelTrait in the set. Returns a different trait set; does not modify this trait set. @param index 0-based index into ordered RelT

Operand type-checking strategy where a given list of operands must all have the same type.

If a node is "AS", returns the underlying expression; otherwise returns the node. Returns null if and only if the node is null.

Returns the {@link Aggregation}s keyed by aggregation name. Lazy init.

Clears this RuleDriver.

Creates a string literal in the system character set. @param s a string (without the sql single quotes) @param pos Parser position

Creates the identity mapping. <p>For example, {@code createIdentity(2)} returns the mapping {0:0, 1:1, 2:2}. @param fieldCount Number of sources/tar

Ends a list which is a call to a function. @param frame Frame @see #startFunCall(String)

This enables to assert the optimized plan without issuing a separate {@code explain ...} command. This is especially useful when {@code RelNode} is pr

Returns the field reference of this program's filter condition, or null if there is no condition.

Returns an array of references to the expressions which this program is to project. Never null, may be empty.

Returns the underlying table, or null if there is none.

If the operator call occurs in an aggregate query, returns whether there are empty groups in the GROUP BY clause. For example, <pre> SELECT count( ) F

Returns whether a node represents the NULL value. <p>Examples: <ul> <li>For {@link SqlLiteral} Unknown, returns false. <li>For <code>CAST(NULL AS <i

Returns whether a member (constructor, method or field) is static.

Adds an input to the explanation of the current node, if a condition holds.

Creates a UnaryExpression that represents a bitwise complement operation.

Returns the value of a literal, cast, or unary minus, as a number; never null.

Returns the Primitive object for a given boxing class. <p>For example, <code>ofBox(java.util.Long.class)</code> returns {@link #LONG}.

Returns an input line, possible extended by the continuation character (\). Scans the script until it finds an un-escaped newline.

Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence.

Returns Linq4j form of arguments. The resulting value is equivalent to {@code rowTranslator().translateList(rexArguments())}. This is handy if you nee

Shorthand for a call to {@link #assertThatNodeTypeCount(Matcher)} with a constant map.

Converts a primitive type to a boxed type; returns other types unchanged.

Creates a LogicalTableScan. @param cluster Cluster @param relOptTable Table @param hints The hints

Creates a root schema. <p>When <code>addMetadataSchema</code> argument is true adds a "metadata" schema containing definitions of tables, columns etc

Returns a function that checks that a particular Elasticsearch pipeline is generated to implement a query. @param strings expected expressions @retur

Gets the key type if this type is a map, otherwise null. @return canonical type descriptor for key

Returns the {@link RelDataTypeFactory type factory} used to generate types for this schema.

Indicates that this operand has several inputs.

Returns the last element in a sequence. (Defined by Queryable.)

Creates an operand checker that applies a single-operand checker to the {@code ordinal}th operand.