Input: [[hr, emps]] or [[emps]] Output: hr.emps or emps

Looks for a matching RexNode from among two lists of RexNodes and returns the offset into the list corresponding to the match, adjusted by an amount,

Locates expressions that can be reduced to literals or converted to expressions with redundant casts removed. @param typeFactory Type factory @par

takes an expression and given a starting index pointing at either ( or [, it finds the corresponding closing char ) or ]

Used by `nary_to_nestedbinary` to find the end pos for expression call

Synchronizes access to the relational algebra generator in case an update is occurring @return {@link #relationalAlgebraGenerator}

Synchronizes access to the catalog service in case an update is occurring. @return {@link #catalogService}

Creates a SessionFactory @return A session factory capable of opening sessions

Gets a table by name @return the table that has this name

@return The names of all the tables in the database by getting them from the keySet() of {@link #databaseTables}

TODO all these return types need to be revisited later. Right now we have issues with some aggregators that only support returning the same input type

* Waits until all messages are ready then returns all of them. * You should never call this function more than once on a WaitingQueue else * race co