IMPALA-6463: [DOCS] Removed query options were deleted from docs The following query option docs and references were removed from docs: - DEFAULT_ORDER_BY_LIMIT - ABORT_ON_DEFAULT_LIMIT_EXCEEDED - V_CPU_CORES (previously removed) - RESERVATION_REQUEST_TIMEOUT (previously removed) - RM_INITIAL_MEM - SCAN_NODE_CODEGEN_THRESHOLD - MAX_IO_BUFFERS - DISABLE_CACHED_READS
Change-Id: I71be3f872468cb22583f82c2238bf72dc82cb750 Cherry-picks: not for 2.x. Reviewed-on: http://gerrit.cloudera.org:8080/10055 Reviewed-by: Tim Armstrong <[email protected]> Tested-by: Impala Public Jenkins <[email protected]> Project: http://git-wip-us.apache.org/repos/asf/impala/repo Commit: http://git-wip-us.apache.org/repos/asf/impala/commit/b4228dfd Tree: http://git-wip-us.apache.org/repos/asf/impala/tree/b4228dfd Diff: http://git-wip-us.apache.org/repos/asf/impala/diff/b4228dfd Branch: refs/heads/master Commit: b4228dfd14975059b2aac68792e63007b5c4e1e2 Parents: d481cd4 Author: Alex Rodoni <[email protected]> Authored: Thu Apr 12 16:31:32 2018 -0700 Committer: Impala Public Jenkins <[email protected]> Committed: Sat Apr 14 00:28:46 2018 +0000 ---------------------------------------------------------------------- docs/impala.ditamap | 6 -- docs/impala_keydefs.ditamap | 6 -- .../impala_abort_on_default_limit_exceeded.xml | 41 --------- docs/topics/impala_default_order_by_limit.xml | 55 ------------ docs/topics/impala_disable_cached_reads.xml | 54 ------------ docs/topics/impala_max_io_buffers.xml | 49 ----------- docs/topics/impala_order_by.xml | 9 -- docs/topics/impala_rm_initial_mem.xml | 47 ---------- .../impala_scan_node_codegen_threshold.xml | 93 -------------------- 9 files changed, 360 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/impala/blob/b4228dfd/docs/impala.ditamap ---------------------------------------------------------------------- diff --git a/docs/impala.ditamap b/docs/impala.ditamap index 89d9553..e6c9c09 100644 --- a/docs/impala.ditamap +++ b/docs/impala.ditamap @@ -170,7 +170,6 @@ under the License. </topicref> <topicref href="topics/impala_set.xml"> <topicref href="topics/impala_query_options.xml"> - <topicref href="topics/impala_abort_on_default_limit_exceeded.xml"/> <topicref href="topics/impala_abort_on_error.xml"/> <topicref href="topics/impala_allow_unsupported_formats.xml"/> <topicref href="topics/impala_appx_count_distinct.xml"/> @@ -180,9 +179,7 @@ under the License. <topicref href="topics/impala_debug_action.xml"/> <topicref rev="2.9.0" href="topics/impala_decimal_v2.xml"/> <topicref rev="2.9.0 IMPALA-5381" href="topics/impala_default_join_distribution_mode.xml"/> - <topicref href="topics/impala_default_order_by_limit.xml"/> <topicref rev="2.10.0 IMPALA-3200" href="topics/impala_default_spillable_buffer_size.xml"/> - <topicref audience="hidden" href="topics/impala_disable_cached_reads.xml"/> <topicref href="topics/impala_disable_codegen.xml"/> <topicref audience="hidden" href="topics/impala_disable_outermost_topn.xml"/> <topicref rev="2.5.0" href="topics/impala_disable_row_runtime_filtering.xml"/> @@ -195,7 +192,6 @@ under the License. <topicref href="topics/impala_live_progress.xml"/> <topicref href="topics/impala_live_summary.xml"/> <topicref href="topics/impala_max_errors.xml"/> - <topicref href="topics/impala_max_io_buffers.xml"/> <topicref rev="2.10.0 IMPALA-3200" href="topics/impala_max_row_size.xml"/> <topicref rev="2.5.0" href="topics/impala_max_num_runtime_filters.xml"/> <topicref href="topics/impala_max_scan_range_length.xml"/> @@ -214,14 +210,12 @@ under the License. <topicref href="topics/impala_query_timeout_s.xml"/> <topicref href="topics/impala_request_pool.xml"/> <topicref rev="2.7.0" href="topics/impala_replica_preference.xml"/> - <topicref audience="hidden" href="topics/impala_rm_initial_mem.xml"/> <topicref rev="2.5.0" href="topics/impala_runtime_bloom_filter_size.xml"/> <topicref rev="2.6.0" href="topics/impala_runtime_filter_max_size.xml"/> <topicref rev="2.6.0" href="topics/impala_runtime_filter_min_size.xml"/> <topicref rev="2.5.0" href="topics/impala_runtime_filter_mode.xml"/> <topicref rev="2.5.0" href="topics/impala_runtime_filter_wait_time_ms.xml"/> <topicref rev="2.6.0" href="topics/impala_s3_skip_insert_staging.xml"/> - <topicref rev="2.5.0" href="topics/impala_scan_node_codegen_threshold.xml"/> <topicref rev="2.5.0" href="topics/impala_schedule_random_replica.xml"/> <topicref rev="2.8.0 IMPALA-3671" href="topics/impala_scratch_limit.xml"/> <!-- This option is for internal use only and might go away without ever being documented. --> http://git-wip-us.apache.org/repos/asf/impala/blob/b4228dfd/docs/impala_keydefs.ditamap ---------------------------------------------------------------------- diff --git a/docs/impala_keydefs.ditamap b/docs/impala_keydefs.ditamap index be64501..0a2ac82 100644 --- a/docs/impala_keydefs.ditamap +++ b/docs/impala_keydefs.ditamap @@ -10768,7 +10768,6 @@ under the License. <keydef href="topics/impala_hints.xml" keys="hints"/> <keydef href="topics/impala_set.xml" keys="set"/> <keydef href="topics/impala_query_options.xml" keys="query_options"/> - <keydef href="topics/impala_abort_on_default_limit_exceeded.xml" keys="abort_on_default_limit_exceeded"/> <keydef href="topics/impala_abort_on_error.xml" keys="abort_on_error"/> <keydef href="topics/impala_allow_unsupported_formats.xml" keys="allow_unsupported_formats"/> <keydef href="topics/impala_appx_count_distinct.xml" keys="appx_count_distinct"/> @@ -10777,9 +10776,7 @@ under the License. <keydef href="topics/impala_compression_codec.xml" keys="compression_codec"/> <keydef href="topics/impala_debug_action.xml" keys="debug_action"/> <keydef href="topics/impala_default_join_distribution_mode.xml" keys="default_join_distribution_mode"/> - <keydef href="topics/impala_default_order_by_limit.xml" keys="default_order_by_limit"/> <keydef rev="2.10.0 IMPALA-3200" href="topics/impala_default_spillable_buffer_size.xml" keys="default_spillable_buffer_size"/> - <keydef href="topics/impala_disable_cached_reads.xml" keys="disable_cached_reads"/> <keydef href="topics/impala_disable_codegen.xml" keys="disable_codegen"/> <keydef href="topics/impala_disable_outermost_topn.xml" keys="disable_outermost_topn"/> <keydef href="topics/impala_disable_row_runtime_filtering.xml" keys="disable_row_runtime_filtering"/> @@ -10792,7 +10789,6 @@ under the License. <keydef href="topics/impala_live_progress.xml" keys="live_progress"/> <keydef href="topics/impala_live_summary.xml" keys="live_summary"/> <keydef href="topics/impala_max_errors.xml" keys="max_errors"/> - <keydef href="topics/impala_max_io_buffers.xml" keys="max_io_buffers"/> <keydef rev="2.10.0 IMPALA-3200" href="topics/impala_max_row_size.xml" keys="max_row_size"/> <keydef href="topics/impala_max_scan_range_length.xml" keys="max_scan_range_length"/> <keydef href="topics/impala_max_num_runtime_filters.xml" keys="max_num_runtime_filters"/> @@ -10812,14 +10808,12 @@ under the License. <keydef href="topics/impala_request_pool.xml" keys="request_pool"/> <keydef href="topics/impala_schedule_random_replica.xml" keys="schedule_random_replica"/> <keydef href="topics/impala_replica_preference.xml" keys="replica_preference"/> - <keydef href="topics/impala_rm_initial_mem.xml" keys="rm_initial_mem"/> <keydef href="topics/impala_runtime_bloom_filter_size.xml" keys="runtime_bloom_filter_size"/> <keydef href="topics/impala_runtime_filter_max_size.xml" keys="runtime_filter_max_size"/> <keydef href="topics/impala_runtime_filter_min_size.xml" keys="runtime_filter_min_size"/> <keydef href="topics/impala_runtime_filter_mode.xml" keys="runtime_filter_mode"/> <keydef href="topics/impala_runtime_filter_wait_time_ms.xml" keys="runtime_filter_wait_time_ms"/> <keydef href="topics/impala_s3_skip_insert_staging.xml" keys="s3_skip_insert_staging"/> - <keydef href="topics/impala_scan_node_codegen_threshold.xml" keys="scan_node_codegen_threshold"/> <keydef href="topics/impala_scratch_limit.xml" keys="scratch_limit"/> <keydef href="topics/impala_support_start_over.xml" keys="support_start_over"/> <keydef href="topics/impala_sync_ddl.xml" keys="sync_ddl"/> http://git-wip-us.apache.org/repos/asf/impala/blob/b4228dfd/docs/topics/impala_abort_on_default_limit_exceeded.xml ---------------------------------------------------------------------- diff --git a/docs/topics/impala_abort_on_default_limit_exceeded.xml b/docs/topics/impala_abort_on_default_limit_exceeded.xml deleted file mode 100644 index ec6973b..0000000 --- a/docs/topics/impala_abort_on_default_limit_exceeded.xml +++ /dev/null @@ -1,41 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!-- -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. ---> -<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> -<concept rev="obwl" id="abort_on_default_limit_exceeded"> - - <title>ABORT_ON_DEFAULT_LIMIT_EXCEEDED Query Option</title> - <titlealts audience="PDF"><navtitle>ABORT_ON_DEFAULT_LIMIT_EXCEEDED</navtitle></titlealts> - <prolog> - <metadata> - <data name="Category" value="Impala"/> - <data name="Category" value="Impala Query Options"/> - <data name="Category" value="Developers"/> - <data name="Category" value="Data Analysts"/> - </metadata> - </prolog> - - <conbody> - - <p conref="../shared/impala_common.xml#common/obwl_query_options"/> - - <p conref="../shared/impala_common.xml#common/type_boolean"/> - <p conref="../shared/impala_common.xml#common/default_false_0"/> - </conbody> -</concept> http://git-wip-us.apache.org/repos/asf/impala/blob/b4228dfd/docs/topics/impala_default_order_by_limit.xml ---------------------------------------------------------------------- diff --git a/docs/topics/impala_default_order_by_limit.xml b/docs/topics/impala_default_order_by_limit.xml deleted file mode 100644 index 5c72126..0000000 --- a/docs/topics/impala_default_order_by_limit.xml +++ /dev/null @@ -1,55 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!-- -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. ---> -<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> -<concept rev="obwl" id="default_order_by_limit"> - - <title>DEFAULT_ORDER_BY_LIMIT Query Option</title> - <titlealts audience="PDF"><navtitle>DEFAULT_ORDER_BY_LIMIT</navtitle></titlealts> - <prolog> - <metadata> - <data name="Category" value="Impala"/> - <data name="Category" value="Impala Query Options"/> - <data name="Category" value="Developers"/> - <data name="Category" value="Data Analysts"/> - </metadata> - </prolog> - - <conbody> - - <p conref="../shared/impala_common.xml#common/obwl_query_options"/> - - <p rev="1.4.0"> - Prior to Impala 1.4.0, Impala queries that use the <codeph><xref href="impala_order_by.xml#order_by">ORDER - BY</xref></codeph> clause must also include a - <codeph><xref href="impala_limit.xml#limit">LIMIT</xref></codeph> clause, to avoid accidentally producing - huge result sets that must be sorted. Sorting a huge result set is a memory-intensive operation. In Impala - 1.4.0 and higher, Impala uses a temporary disk work area to perform the sort if that operation would - otherwise exceed the Impala memory limit on a particular host. - </p> - - <p> - <b>Type: numeric</b> - </p> - - <p> - <b>Default:</b> -1 (no default limit) - </p> - </conbody> -</concept> http://git-wip-us.apache.org/repos/asf/impala/blob/b4228dfd/docs/topics/impala_disable_cached_reads.xml ---------------------------------------------------------------------- diff --git a/docs/topics/impala_disable_cached_reads.xml b/docs/topics/impala_disable_cached_reads.xml deleted file mode 100644 index 20391db..0000000 --- a/docs/topics/impala_disable_cached_reads.xml +++ /dev/null @@ -1,54 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!-- -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. ---> -<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> -<concept id="disable_cached_reads" rev="1.4.0"> - - <title>DISABLE_CACHED_READS Query Option</title> - <prolog> - <metadata> - <data name="Category" value="Impala"/> - <data name="Category" value="Impala Query Options"/> - <data name="Category" value="HDFS"/> - <data name="Category" value="HDFS Caching"/> - <data name="Category" value="Querying"/> - <data name="Category" value="Performance"/> - <data name="Category" value="Developers"/> - <data name="Category" value="Data Analysts"/> - </metadata> - </prolog> - - <conbody> - - <p> - <indexterm audience="hidden">DISABLE_CACHED_READS query option</indexterm> - Prevents Impala from reading data files that are <q>pinned</q> in memory - through the HDFS caching feature. Primarily a debugging option for - cases where processing of HDFS cached data is concentrated on a single - host, leading to excessive CPU usage on that host. - </p> - - <p conref="../shared/impala_common.xml#common/type_boolean"/> - - <p conref="../shared/impala_common.xml#common/default_false"/> - - <p conref="../shared/impala_common.xml#common/added_in_140"/> - - </conbody> -</concept> http://git-wip-us.apache.org/repos/asf/impala/blob/b4228dfd/docs/topics/impala_max_io_buffers.xml ---------------------------------------------------------------------- diff --git a/docs/topics/impala_max_io_buffers.xml b/docs/topics/impala_max_io_buffers.xml deleted file mode 100644 index 747b4d9..0000000 --- a/docs/topics/impala_max_io_buffers.xml +++ /dev/null @@ -1,49 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!-- -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. ---> -<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> -<concept id="max_io_buffers"> - - <title>MAX_IO_BUFFERS Query Option</title> - <titlealts audience="PDF"><navtitle>MAX_IO_BUFFERS</navtitle></titlealts> - <prolog> - <metadata> - <data name="Category" value="Impala"/> - <data name="Category" value="Impala Query Options"/> - <data name="Category" value="Deprecated Features"/> - <data name="Category" value="Developers"/> - <data name="Category" value="Data Analysts"/> - </metadata> - </prolog> - - <conbody> - - <p> - Deprecated query option. Currently has no effect. - </p> - - <p> - <b>Type:</b> numeric - </p> - - <p> - <b>Default:</b> 0 - </p> - </conbody> -</concept> http://git-wip-us.apache.org/repos/asf/impala/blob/b4228dfd/docs/topics/impala_order_by.xml ---------------------------------------------------------------------- diff --git a/docs/topics/impala_order_by.xml b/docs/topics/impala_order_by.xml index 1c5ac98..a72f74e 100644 --- a/docs/topics/impala_order_by.xml +++ b/docs/topics/impala_order_by.xml @@ -265,15 +265,6 @@ SELECT page_title AS "Page 3 of search results", page_url FROM search_content </p> </li> - <li> - <p> - The query options - <xref href="impala_default_order_by_limit.xml#default_order_by_limit">DEFAULT_ORDER_BY_LIMIT</xref> and - <xref href="impala_abort_on_default_limit_exceeded.xml#abort_on_default_limit_exceeded">ABORT_ON_DEFAULT_LIMIT_EXCEEDED</xref>, - which formerly controlled the behavior of <codeph>ORDER BY</codeph> queries with no limit specified, are - now ignored. - </p> - </li> </ul> <p rev="obwl" conref="../shared/impala_common.xml#common/null_sorting_change"/> http://git-wip-us.apache.org/repos/asf/impala/blob/b4228dfd/docs/topics/impala_rm_initial_mem.xml ---------------------------------------------------------------------- diff --git a/docs/topics/impala_rm_initial_mem.xml b/docs/topics/impala_rm_initial_mem.xml deleted file mode 100644 index fd9f819..0000000 --- a/docs/topics/impala_rm_initial_mem.xml +++ /dev/null @@ -1,47 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!-- -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. ---> -<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> -<concept id="rm_initial_mem" rev="2.5.0"> - - <title>RM_INITIAL_MEM Query Option</title> - <prolog> - <metadata> - <data name="Category" value="Impala"/> - <data name="Category" value="Impala Query Options"/> - <data name="Category" value="Developers"/> - <data name="Category" value="Data Analysts"/> - </metadata> - </prolog> - - <conbody> - - <p rev="2.5.0"> - <indexterm audience="hidden">RM_INITIAL_MEM query option</indexterm> - </p> - - <p> - <b>Type:</b> - </p> - - <p> - <b>Default:</b> - </p> - </conbody> -</concept> http://git-wip-us.apache.org/repos/asf/impala/blob/b4228dfd/docs/topics/impala_scan_node_codegen_threshold.xml ---------------------------------------------------------------------- diff --git a/docs/topics/impala_scan_node_codegen_threshold.xml b/docs/topics/impala_scan_node_codegen_threshold.xml deleted file mode 100644 index 40d1bc6..0000000 --- a/docs/topics/impala_scan_node_codegen_threshold.xml +++ /dev/null @@ -1,93 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!-- -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. ---> -<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> -<concept id="scan_node_codegen_threshold" rev="2.5.0 IMPALA-1755"> - - <title>SCAN_NODE_CODEGEN_THRESHOLD Query Option (<keyword keyref="impala25"/> or higher only)</title> - <titlealts audience="PDF"><navtitle>SCAN_NODE_CODEGEN_THRESHOLD</navtitle></titlealts> - <prolog> - <metadata> - <data name="Category" value="Impala"/> - <data name="Category" value="Impala Query Options"/> - <data name="Category" value="Performance"/> - <data name="Category" value="Developers"/> - <data name="Category" value="Data Analysts"/> - </metadata> - </prolog> - - <conbody> - - <p rev="2.5.0 IMPALA-1755"> - <indexterm audience="hidden">SCAN_NODE_CODEGEN_THRESHOLD query option</indexterm> - The <codeph>SCAN_NODE_CODEGEN_THRESHOLD</codeph> query option - adjusts the aggressiveness of the code generation optimization process - when performing I/O read operations. It can help to work around performance problems - for queries where the table is small and the <codeph>WHERE</codeph> clause is complicated. - </p> - - <p conref="../shared/impala_common.xml#common/type_integer"/> - - <p> - <b>Default:</b> 1800000 (1.8 million) - </p> - - <p conref="../shared/impala_common.xml#common/added_in_250"/> - - <p conref="../shared/impala_common.xml#common/usage_notes_blurb"/> - - <p> - This query option is intended mainly for the case where a query with a very complicated - <codeph>WHERE</codeph> clause, such as an <codeph>IN</codeph> operator with thousands - of entries, is run against a small table, especially a small table using Parquet format. - The code generation phase can become the dominant factor in the query response time, - making the query take several seconds even though there is relatively little work to do. - In this case, increase the value of this option to a much larger amount, anything up to - the maximum for a 32-bit integer. - </p> - - <p> - Because this option only affects the code generation phase for the portion of the - query that performs I/O (the <term>scan nodes</term> within the query plan), it - lets you continue to keep code generation enabled for other queries, and other parts - of the same query, that can benefit from it. In contrast, the - <codeph>IMPALA_DISABLE_CODEGEN</codeph> query option turns off code generation entirely. - </p> - - <p> - Because of the way the work for queries is divided internally, this option might not - affect code generation for all kinds of queries. If a plan fragment contains a scan - node and some other kind of plan node, code generation still occurs regardless of - this option setting. - </p> - - <p> - To use this option effectively, you should be familiar with reading query profile output - to determine the proportion of time spent in the code generation phase, and whether - code generation is enabled or not for specific plan fragments. - </p> - -<!-- - <p conref="../shared/impala_common.xml#common/related_info"/> - <p> - </p> ---> - - </conbody> -</concept>
