Abstract: A method of preventing queries from accessing database files based on metadata. The method includes determining a first metadata associated with a particular file and a second metadata associated with a changed version of the particular file. The method includes directing, based on the first metadata associated with the particular file, a first query for the particular file to a first file that is associated with the particular file. The method includes preventing a second query for the particular file from accessing the particular file by directing, based on the second metadata associated with the changed version of the particular file, the second query to the changed version of the particular file instead of the particular file.

Abstract: A method, apparatus, and system for join operations of a plurality of relations that are distributed over a plurality of storage locations over a network of computing components.

Abstract: A method for directing queries to encrypted database files includes acquiring a mapping that links a first encrypted file with a different encrypted file. The first encrypted file is generated based on a first encryption key. The method includes generating, by one or more processors based on the mapping, an updated mapping to link a second encrypted file with the different encrypted file. The second encrypted file is generated based on a second encryption key. The method includes directing, using the mapping, a first query to the first encrypted file when the first query arrives before generating the updated mapping; and. The method includes directing, using the updated mapping, a second query to the second encrypted file when a second query arrives after generating the updated mapping.

Abstract: A planar electro-optic Mach-Zehnder modulator (MZM) includes two optical waveguide arms and three drive electrodes extending along the optical waveguide arms to modulate light propagating therein. A middle one of the drive electrodes is between the two optical waveguide arms, and the two optical waveguide arms are between outer ones of the drive electrodes. An electrical drive circuit is connected to provide first modulation signals to the two outer ones of the drive electrodes and a second modulation signal to the middle one of the drive electrodes, wherein the second modulation signal is voltage-inverted relative to the first modulation signals.

Abstract: A query directed to database data stored across a set of files is received. The query includes predicates applied against metadata of the set of files. One or more files are removed from the set of files whose metadata does not satisfy a predicate of the plurality of predicates. Rows of the one or more remaining files of the set of files are filtered based on the one or more predicates.

Abstract: A locking device for locking an object capable of sliding along a cable, the device includes the cable and a clamp, the cable passing through the clamp while extending along an axis, the clamp comprising: a fixed part connected to the object, a ring comprising an elastic material with fluid behavior, the ring comprising a central cavity through which the cable passes, an actuator configured to compress the ring between two shapes, in a first shape, referred to as the open shape, the cable being able to run freely in the central cavity and in a second shape, referred to as the closed shape, the cable being compressed by the ring.

Abstract: A device for locking an object suspended from a cable passing through a clamp and extending along a substantially vertical axis, the clamp includes a fixed part, at least two moving jaws, a first actuator and a second actuator, the two jaws coming into contact with the cable to immobilize the cable by clamping in a closed position and moving away from the cable in an open position, the fixed part having as many inclined surfaces as there are jaws, each of the jaws being configured to slide along one of the inclined surfaces so as to pass from the open position to the closed position, the first actuator being configured to move the jaws upward, make them slide along their respective inclined surface and allow the clamp to close, the second actuator being configured to pull downward on the cable with respect to the fixed part and allow the clamp to open.

Abstract: A method, apparatus, and system for join operations of a plurality of relations that are distributed over a plurality of storage locations over a network of computing components.

Abstract: A method, apparatus, and system for join operations of a plurality of relations that are distributed over a plurality of storage locations over a network of computing components.

Abstract: A low-drag dipping sonar includes an antenna equipped with acoustic transmitters and receivers. The dipping sonar further comprises a motorized winch comprising a reel, and an actuator configured to rotate the reel and a cable wound on the reel, in that the winch is placed in the antenna, and in that the cable allows the antenna to be hooked to a carrier at its one free end of the cable.

Abstract: A method for directing queries to encrypted database files includes acquiring a mapping that links a first encrypted file with a different encrypted file. The first encrypted file is generated based on a first encryption key. The method includes generating, by one or more processors based on the mapping, an updated mapping to link a second encrypted file with the different encrypted file. The second encrypted file is generated based on a second encryption key. The method includes determining an arrival time of a query. The method includes directing, based on the arrival time, the query to the first encrypted file or the second encrypted file.

Abstract: A method, apparatus, and system for join operations of a plurality of relations that are distributed over a plurality of storage locations over a network of computing components.

Abstract: A gas injection system includes a tubular wall 3 capable of being thermally stressed and having a proximal extremity and a distal extremity 11, at the distal extremity, at least one extremity opening through which at least one gas is projected. A cooling is system located in the tubular wall including axial channels 12 which extend axially towards the distal extremity and in which a cooling fluid is circulated. Connecting channels 13 circumferentially join the axial channels to each other at the distal extremity of the tubular wall. The connecting channels, which circumferentially join the axial channels at the distal extremity of the tubular wall, have a rounded shape in the direction of the distal extremity.

Abstract: A method, apparatus, and system for join operations of a plurality of relations that are distributed over a plurality of storage locations over a network of computing components.

Abstract: A method for encrypting database files includes generating a mapping for a plurality of encrypted files. A first encrypted file of the plurality of encrypted files is encrypted with a first encryption key. The method includes generating a second encrypted file by re-encrypting, for a period of time, data in the first encrypted file using a second encryption key. The first encrypted file remains accessible to one or more queries during the period of time. The method includes updating the mapping to associate the second encrypted file with the first encrypted file. The mapping is updated after the second encrypted file has been generated. The method includes preventing a query from accessing the first encrypted file after the second encrypted file has been generated.

Abstract: A query directed to database data stored across a set of files is received. The query includes predicates and each file from the set of files is associated with metadata stored in a metadata store that is separate from a storage platform that stores the set of files. One or more files are removed from the set of files whose metadata does not satisfy a predicate of the plurality of predicates to generate a pruned set of files. One or more predicates are removed that are satisfied by the metadata of the pruned set of files to generate a modified query.

Abstract: A method, apparatus, and system including performing a partitioning function on a first table of a join query, determining a size of the first table based on the partitioning function, and distributing the first table to a set of nodes of a computing cluster based on the size of the first table.

Abstract: A method, apparatus, and system including performing a partitioning function on a first table of a join query, determining a size of the first table based on the partitioning function, and distributing the first table to a set of nodes of a computing cluster based on the size of the first table.

Abstract: A method, apparatus, and system for join operations of a plurality of relations that are distributed over a plurality of storage locations over a network of computing components.

Abstract: A method, apparatus, and system for join operations of a plurality of relations that are distributed over a plurality of storage locations over a network of computing components. An example method includes: receiving a relational join query for a join operation associated with a first relation and a second relation; generating at least one build operator and at least one probe operator to perform build operations and probe operations, respectively, of the join operation; and managing a state of one or more communication links between the at least one build operator and the at least one probe operator based on a size of the second relation as determined by the at least one build operator and an estimated size of the first relation.