AngersZhuuuu commented on a change in pull request #31010: URL: https://github.com/apache/spark/pull/31010#discussion_r615570479
########## File path: docs/sql-ref-syntax-qry-select-transform.md ########## @@ -0,0 +1,242 @@ +--- +layout: global +title: TRANSFORM +displayTitle: TRANSFORM +license: | + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--- + +### Description + +The `TRANSFORM` clause is used to specify a Hive-style transform query specification +to transform the inputs by running a user-specified command or script. + +### Syntax + +```sql +SELECT TRANSFORM ( expression [ , ... ] ) + [ ROW FORMAT row_format ] + [ RECORDWRITER record_writer_class ] + USING command_or_script [ AS ( [ col_name [ col_type ] ] [ , ... ] ) ] + [ ROW FORMAT row_format ] + [ RECORDREADER record_reader_class ] + +row_format: + : SERDE serde_class [ WITH SERDEPROPERTIES (k1=v1, k2=v2, ... ) ] + | DELIMITED [ FIELDS TERMINATED BY fields_terminated_char [ ESCAPED BY escaped_char ] ] + [ COLLECTION ITEMS TERMINATED BY collection_items_terminated_char ] + [ MAP KEYS TERMINATED BY map_key_terminated_char ] + [ LINES TERMINATED BY row_terminated_char ] + [ NULL DEFINED AS null_char ] +``` + +### Parameters + +* **expression** + + Specifies a combination of one or more values, operators and SQL functions that results in a value. + +* **row_format** + + Spark uses the `SERDE` clause to specify a custom SerDe for one table. Otherwise, use the `DELIMITED` clause to use the native SerDe and specify the delimiter, escape character, null character and so on. + +* **SERDE** + + Specifies a custom SerDe for one table. + +* **serde_class** + + Specifies a fully-qualified class name of a custom SerDe. + +* **DELIMITED** + + The `DELIMITED` clause can be used to specify the native SerDe and state the delimiter, escape character, null character and so on. + +* **FIELDS TERMINATED BY** + + Used to define a column separator. + +* **COLLECTION ITEMS TERMINATED BY** + + Used to define a collection item separator. + +* **MAP KEYS TERMINATED BY** + + Used to define a map key separator. + +* **LINES TERMINATED BY** + + Used to define a row separator. + +* **NULL DEFINED AS** + + Used to define the specific value for NULL. + +* **ESCAPED BY** + + Used for escape mechanism. + +* **RECORDWRITER** + + Specifies a fully-qualified class name of a custom RecordWriter. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordWriter`. + +* **RECORDREADER** + + Specifies a fully-qualified class name of a custom RecordReader. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordReader`. + +* **command_or_script** + + Specifies a command or a path to script to process data. + +### SerDe behavior + +Spark uses Hive Serde `org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe` by default, columns will be casted +to `STRING` and combined by tabs before feeding to the user script. All `NULL` values will be converted +to the literal string `"\N"` in order to differentiate `NULL` values from empty strings. The standard output of the +user script will be treated as TAB-separated STRING columns, any cell containing only `"\N"` will be re-interpreted +as a `NULL`, and then the resulting STRING column will be cast to the data type specified in the table declaration +in the usual way. If the actual number of output columns is less than the number of specified output columns, +insufficient output columns will be supplemented with `NULL`. If the actual number of output columns is more than the +number of specified output columns, the output columns will only select the corresponding columns and the remaining part +will be discarded. If there is no `AS` clause after `USING my_script`, Spark assumes that the output of the script contains 2 parts: + + 1. key: which is before the first tab. + 2. value: which is the rest after the first tab. + +If there is no enough tab, Spark will return `NULL` value in `SERDE` mode or throw `ArrayOutOfBoundsException` in `DELIMITED` mode. +Note that this is different from specifying an `AS key, value` because in that case, the value will only contain the portion +between the first tab and the second tab if there are multiple tabs. +User scripts can output debug information to standard error which will be shown on the task detail Review comment: Removed ########## File path: docs/sql-ref-syntax-qry-select-transform.md ########## @@ -0,0 +1,242 @@ +--- +layout: global +title: TRANSFORM +displayTitle: TRANSFORM +license: | + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--- + +### Description + +The `TRANSFORM` clause is used to specify a Hive-style transform query specification +to transform the inputs by running a user-specified command or script. + +### Syntax + +```sql +SELECT TRANSFORM ( expression [ , ... ] ) + [ ROW FORMAT row_format ] + [ RECORDWRITER record_writer_class ] + USING command_or_script [ AS ( [ col_name [ col_type ] ] [ , ... ] ) ] + [ ROW FORMAT row_format ] + [ RECORDREADER record_reader_class ] + +row_format: + : SERDE serde_class [ WITH SERDEPROPERTIES (k1=v1, k2=v2, ... ) ] + | DELIMITED [ FIELDS TERMINATED BY fields_terminated_char [ ESCAPED BY escaped_char ] ] + [ COLLECTION ITEMS TERMINATED BY collection_items_terminated_char ] + [ MAP KEYS TERMINATED BY map_key_terminated_char ] + [ LINES TERMINATED BY row_terminated_char ] + [ NULL DEFINED AS null_char ] +``` + +### Parameters + +* **expression** + + Specifies a combination of one or more values, operators and SQL functions that results in a value. + +* **row_format** + + Spark uses the `SERDE` clause to specify a custom SerDe for one table. Otherwise, use the `DELIMITED` clause to use the native SerDe and specify the delimiter, escape character, null character and so on. + +* **SERDE** + + Specifies a custom SerDe for one table. + +* **serde_class** + + Specifies a fully-qualified class name of a custom SerDe. + +* **DELIMITED** + + The `DELIMITED` clause can be used to specify the native SerDe and state the delimiter, escape character, null character and so on. + +* **FIELDS TERMINATED BY** + + Used to define a column separator. + +* **COLLECTION ITEMS TERMINATED BY** + + Used to define a collection item separator. + +* **MAP KEYS TERMINATED BY** + + Used to define a map key separator. + +* **LINES TERMINATED BY** + + Used to define a row separator. + +* **NULL DEFINED AS** + + Used to define the specific value for NULL. + +* **ESCAPED BY** + + Used for escape mechanism. + +* **RECORDWRITER** + + Specifies a fully-qualified class name of a custom RecordWriter. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordWriter`. + +* **RECORDREADER** + + Specifies a fully-qualified class name of a custom RecordReader. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordReader`. + +* **command_or_script** + + Specifies a command or a path to script to process data. + +### SerDe behavior + +Spark uses Hive Serde `org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe` by default, columns will be casted +to `STRING` and combined by tabs before feeding to the user script. All `NULL` values will be converted +to the literal string `"\N"` in order to differentiate `NULL` values from empty strings. The standard output of the +user script will be treated as TAB-separated STRING columns, any cell containing only `"\N"` will be re-interpreted +as a `NULL`, and then the resulting STRING column will be cast to the data type specified in the table declaration +in the usual way. If the actual number of output columns is less than the number of specified output columns, +insufficient output columns will be supplemented with `NULL`. If the actual number of output columns is more than the +number of specified output columns, the output columns will only select the corresponding columns and the remaining part +will be discarded. If there is no `AS` clause after `USING my_script`, Spark assumes that the output of the script contains 2 parts: Review comment: Done ########## File path: docs/sql-ref-syntax-qry-select-transform.md ########## @@ -0,0 +1,242 @@ +--- +layout: global +title: TRANSFORM +displayTitle: TRANSFORM +license: | + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--- + +### Description + +The `TRANSFORM` clause is used to specify a Hive-style transform query specification +to transform the inputs by running a user-specified command or script. + +### Syntax + +```sql +SELECT TRANSFORM ( expression [ , ... ] ) + [ ROW FORMAT row_format ] + [ RECORDWRITER record_writer_class ] + USING command_or_script [ AS ( [ col_name [ col_type ] ] [ , ... ] ) ] + [ ROW FORMAT row_format ] + [ RECORDREADER record_reader_class ] + +row_format: + : SERDE serde_class [ WITH SERDEPROPERTIES (k1=v1, k2=v2, ... ) ] + | DELIMITED [ FIELDS TERMINATED BY fields_terminated_char [ ESCAPED BY escaped_char ] ] + [ COLLECTION ITEMS TERMINATED BY collection_items_terminated_char ] + [ MAP KEYS TERMINATED BY map_key_terminated_char ] + [ LINES TERMINATED BY row_terminated_char ] + [ NULL DEFINED AS null_char ] +``` + +### Parameters + +* **expression** + + Specifies a combination of one or more values, operators and SQL functions that results in a value. + +* **row_format** + + Spark uses the `SERDE` clause to specify a custom SerDe for one table. Otherwise, use the `DELIMITED` clause to use the native SerDe and specify the delimiter, escape character, null character and so on. + +* **SERDE** + + Specifies a custom SerDe for one table. + +* **serde_class** + + Specifies a fully-qualified class name of a custom SerDe. + +* **DELIMITED** + + The `DELIMITED` clause can be used to specify the native SerDe and state the delimiter, escape character, null character and so on. + +* **FIELDS TERMINATED BY** + + Used to define a column separator. + +* **COLLECTION ITEMS TERMINATED BY** + + Used to define a collection item separator. + +* **MAP KEYS TERMINATED BY** + + Used to define a map key separator. + +* **LINES TERMINATED BY** + + Used to define a row separator. + +* **NULL DEFINED AS** + + Used to define the specific value for NULL. + +* **ESCAPED BY** + + Used for escape mechanism. + +* **RECORDWRITER** + + Specifies a fully-qualified class name of a custom RecordWriter. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordWriter`. + +* **RECORDREADER** + + Specifies a fully-qualified class name of a custom RecordReader. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordReader`. + +* **command_or_script** + + Specifies a command or a path to script to process data. + +### SerDe behavior + +Spark uses Hive Serde `org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe` by default, columns will be casted +to `STRING` and combined by tabs before feeding to the user script. All `NULL` values will be converted +to the literal string `"\N"` in order to differentiate `NULL` values from empty strings. The standard output of the +user script will be treated as TAB-separated STRING columns, any cell containing only `"\N"` will be re-interpreted +as a `NULL`, and then the resulting STRING column will be cast to the data type specified in the table declaration +in the usual way. If the actual number of output columns is less than the number of specified output columns, Review comment: Done ########## File path: docs/sql-ref-syntax-qry-select-transform.md ########## @@ -0,0 +1,242 @@ +--- +layout: global +title: TRANSFORM +displayTitle: TRANSFORM +license: | + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--- + +### Description + +The `TRANSFORM` clause is used to specify a Hive-style transform query specification +to transform the inputs by running a user-specified command or script. + +### Syntax + +```sql +SELECT TRANSFORM ( expression [ , ... ] ) + [ ROW FORMAT row_format ] + [ RECORDWRITER record_writer_class ] + USING command_or_script [ AS ( [ col_name [ col_type ] ] [ , ... ] ) ] + [ ROW FORMAT row_format ] + [ RECORDREADER record_reader_class ] + +row_format: + : SERDE serde_class [ WITH SERDEPROPERTIES (k1=v1, k2=v2, ... ) ] + | DELIMITED [ FIELDS TERMINATED BY fields_terminated_char [ ESCAPED BY escaped_char ] ] + [ COLLECTION ITEMS TERMINATED BY collection_items_terminated_char ] + [ MAP KEYS TERMINATED BY map_key_terminated_char ] + [ LINES TERMINATED BY row_terminated_char ] + [ NULL DEFINED AS null_char ] +``` + +### Parameters + +* **expression** + + Specifies a combination of one or more values, operators and SQL functions that results in a value. + +* **row_format** + + Spark uses the `SERDE` clause to specify a custom SerDe for one table. Otherwise, use the `DELIMITED` clause to use the native SerDe and specify the delimiter, escape character, null character and so on. + +* **SERDE** + + Specifies a custom SerDe for one table. + +* **serde_class** + + Specifies a fully-qualified class name of a custom SerDe. + +* **DELIMITED** + + The `DELIMITED` clause can be used to specify the native SerDe and state the delimiter, escape character, null character and so on. + +* **FIELDS TERMINATED BY** + + Used to define a column separator. + +* **COLLECTION ITEMS TERMINATED BY** + + Used to define a collection item separator. + +* **MAP KEYS TERMINATED BY** + + Used to define a map key separator. + +* **LINES TERMINATED BY** + + Used to define a row separator. + +* **NULL DEFINED AS** + + Used to define the specific value for NULL. + +* **ESCAPED BY** + + Used for escape mechanism. + +* **RECORDWRITER** + + Specifies a fully-qualified class name of a custom RecordWriter. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordWriter`. + +* **RECORDREADER** + + Specifies a fully-qualified class name of a custom RecordReader. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordReader`. + +* **command_or_script** + + Specifies a command or a path to script to process data. + +### SerDe behavior + +Spark uses Hive Serde `org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe` by default, columns will be casted +to `STRING` and combined by tabs before feeding to the user script. All `NULL` values will be converted +to the literal string `"\N"` in order to differentiate `NULL` values from empty strings. The standard output of the +user script will be treated as TAB-separated STRING columns, any cell containing only `"\N"` will be re-interpreted Review comment: Done ########## File path: docs/sql-ref-syntax-qry-select-transform.md ########## @@ -0,0 +1,242 @@ +--- +layout: global +title: TRANSFORM +displayTitle: TRANSFORM +license: | + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--- + +### Description + +The `TRANSFORM` clause is used to specify a Hive-style transform query specification +to transform the inputs by running a user-specified command or script. + +### Syntax + +```sql +SELECT TRANSFORM ( expression [ , ... ] ) + [ ROW FORMAT row_format ] + [ RECORDWRITER record_writer_class ] + USING command_or_script [ AS ( [ col_name [ col_type ] ] [ , ... ] ) ] + [ ROW FORMAT row_format ] + [ RECORDREADER record_reader_class ] + +row_format: + : SERDE serde_class [ WITH SERDEPROPERTIES (k1=v1, k2=v2, ... ) ] + | DELIMITED [ FIELDS TERMINATED BY fields_terminated_char [ ESCAPED BY escaped_char ] ] + [ COLLECTION ITEMS TERMINATED BY collection_items_terminated_char ] + [ MAP KEYS TERMINATED BY map_key_terminated_char ] + [ LINES TERMINATED BY row_terminated_char ] + [ NULL DEFINED AS null_char ] +``` + +### Parameters + +* **expression** + + Specifies a combination of one or more values, operators and SQL functions that results in a value. + +* **row_format** + + Spark uses the `SERDE` clause to specify a custom SerDe for one table. Otherwise, use the `DELIMITED` clause to use the native SerDe and specify the delimiter, escape character, null character and so on. + +* **SERDE** + + Specifies a custom SerDe for one table. + +* **serde_class** + + Specifies a fully-qualified class name of a custom SerDe. + +* **DELIMITED** + + The `DELIMITED` clause can be used to specify the native SerDe and state the delimiter, escape character, null character and so on. + +* **FIELDS TERMINATED BY** + + Used to define a column separator. + +* **COLLECTION ITEMS TERMINATED BY** + + Used to define a collection item separator. + +* **MAP KEYS TERMINATED BY** + + Used to define a map key separator. + +* **LINES TERMINATED BY** + + Used to define a row separator. + +* **NULL DEFINED AS** + + Used to define the specific value for NULL. + +* **ESCAPED BY** + + Used for escape mechanism. + +* **RECORDWRITER** + + Specifies a fully-qualified class name of a custom RecordWriter. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordWriter`. + +* **RECORDREADER** + + Specifies a fully-qualified class name of a custom RecordReader. The default value is `org.apache.hadoop.hive.ql.exec.TextRecordReader`. + +* **command_or_script** + + Specifies a command or a path to script to process data. + +### SerDe behavior + +Spark uses Hive Serde `org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe` by default, columns will be casted Review comment: Done ########## File path: docs/sql-ref-syntax-qry-select-transform.md ########## @@ -0,0 +1,242 @@ +--- +layout: global +title: TRANSFORM +displayTitle: TRANSFORM +license: | + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--- + +### Description + +The `TRANSFORM` clause is used to specify a Hive-style transform query specification +to transform the inputs by running a user-specified command or script. + +### Syntax + +```sql +SELECT TRANSFORM ( expression [ , ... ] ) + [ ROW FORMAT row_format ] + [ RECORDWRITER record_writer_class ] + USING command_or_script [ AS ( [ col_name [ col_type ] ] [ , ... ] ) ] + [ ROW FORMAT row_format ] + [ RECORDREADER record_reader_class ] + +row_format: + : SERDE serde_class [ WITH SERDEPROPERTIES (k1=v1, k2=v2, ... ) ] Review comment: Done -- This is an automated message from the Apache Git Service. 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