All rights reserved. STRICTLY CONFIDENTIAL Begin Content Area = 16,30 $ ￥ € $ €￥ $ £ ￥ ￡ ￥ UDF in ClickHouse Concept, Develpoment, and Application in ML Systems Begin Content Area = 16,30 2 structure and the well-designed API • We maintains a custom build Begin Content Area = 16,30 11 The UDF Magic Begin Content Area = 16,30 12 When the “Standard” SQL is not Enough Functionality Limitations pow(stddevPop(x), 3) FROM data Begin Content Area = 16,30 14 A UDF Can Do the Trick User-Defined Functions (UDF) • A function provided by the user UDF in ClickHouse • Scalar functions • Aggregate functions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 13.3.1. “Upgrading” ib_udf functions in an existing database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 are not internal to the engine, but defined in separate modules. Firebird ships with two UDF libraries: ib_udf (a widely used “InterBase library”) and fbudf. You can add more libraries, e.g. by buying cause of this problem is that with “old style” UDF calling (inherited from InterBase), it is not possible to pass NULL as input to the function. When a UDF like LTRIM (left trim) is called with a NULL

value that is compatible with datatype genname Sequence (generator) name func Internal function or UDF The CREATE DOMAIN statement creates a new domain. Any SQL data type can be specified as the domain that is allowed in the given context genname Sequence (generator) name func Internal function or UDF The CREATE TABLE statement creates a new table. Any user can create it and its name must be unique run UDFs at all will now require an explicit configuration of Restrict path- list • The UDF libraries (ib_udf, fbudf) are no longer distributed in the installation kits • Most of the functions in the

the given Python virtual environment at client side (for job compiling) and server side (for Python UDF execution) separately. 1.1. Getting Started 7 pyflink-docs, Release release-1.15 • Specify the Python -pyexec is also required to specify the Python virtual environment to use at server side (for Python UDF execution). For the Python virtual environment at client side (for job compiling), option -pyclientexec the given Python virtual environment at client side (for job compiling) and server side (for Python UDF execution) separately. • Specify the Python virtual environments during submitting PyFlink jobs It

the given Python virtual environment at client side (for job compiling) and server side (for Python UDF execution) separately. 1.1. Getting Started 7 pyflink-docs, Release release-1.16 • Specify the Python -pyexec is also required to specify the Python virtual environment to use at server side (for Python UDF execution). For the Python virtual environment at client side (for job compiling), option -pyclientexec the given Python virtual environment at client side (for job compiling) and server side (for Python UDF execution) separately. • Specify the Python virtual environments during submitting PyFlink jobs It

value that is compatible with datatype genname Sequence (generator) name func Internal function or UDF The CREATE DOMAIN statement creates a new domain. Any SQL data type can be specified as the domain value that is compatible with datatype genname Sequence (generator) name func Internal function or UDF The ALTER DOMAIN statement enables changes to the current attributes of a domain, including its name Chapter 5. Data Definition (DDL) Statements 102 Parameter Description func Internal function or UDF The CREATE TABLE statement creates a new table. Any user can create it and its name must be unique

support (fbintl.dll and fbintl.conf) or UDF libraries, create subdirectories beneath the application root for them, emulating the Firebird server ones, e.g. /intl or /udf, respectively. Rename fbembed.dll conf c:\my_app\firebird.msg c:\my_app\intl\fbintl.dll c:\my_app\intl\fbintl.conf c:\my_app\udf\fbudf.dll Suppose you want to place the Firebird files (excluding the renamed fbembed.dll) Installing on Windows 29 d:\fb\firebird.msg d:\fb\intl\fbintl.dll d:\fb\intl\fbintl.conf d:\fb\udf\fbudf.dll In firebird.conf: RootDirectory = d:\fb Client-only Installs In the past

Sample database employee.gdb \ex- amples User-defined function (UDF) libraries ib_udf.dll & fbudf.dll \UDF Firebird client gds32.dll Windows System dir- ectory (see note below table) gstat, etc. /bin Sample database employee.gdb /ex- amples UDF libraries ib_udf.so /UDF Firebird client libgds.so.0 (binary), libgds.so (symlink) /usr/lib (actually

GENERATOR -607 335544816 udf_name UDF -607 336003074 dsql_dbkey_from_non_table Cannot SELECT RDB$DB_KEY from a stored procedure. -607 336003086 dsql_udf_return_pos_err External function 335544716 svc_in_use Service is currently busy: -901 335544731 tra_must_sweep -901 335544740 udf_exception A fatal exception occurred during the execution of a user defined function. -901 335544741