capability of querying hierarchical data recur- sively or non-recursively and meets the needs of using tree queries to implement ap- plication logics in multiple sectors such as human resources, manufacturing execution process of IndexMerge the same as that of IndexLookUp. While the structure appears as a tree, executing the query does not strictly require the child nodes to be completed before the parent nodes document describes the implementation of TopN and Limit operator pushdown. In the TiDB execution plan tree, the LIMIT clause in SQL corresponds to the Limit operator node, and the ORDER BY clause corresponds

execution process of IndexMerge the same as that of IndexLookUp. While the structure appears as a tree, executing the query does not strictly require the child nodes to be completed before the parent nodes document describes the implementation of TopN and Limit operator pushdown. In the TiDB execution plan tree, the LIMIT clause in SQL corresponds to the Limit operator node, and the ORDER BY clause corresponds sorting rule. Similar to predicate pushdown, TopN and Limit are pushed down in the execution plan tree to a position as close to the data source as possible so that the required data is filtered at an

execution process of IndexMerge the same as that of IndexLookUp. While the structure appears as a tree, executing the query does not strictly require the child nodes to be completed before the parent nodes document describes the implementation of TopN and Limit operator pushdown. In the TiDB execution plan tree, the LIMIT clause in SQL corresponds to the Limit operator node, and the ORDER BY clause corresponds sorting rule. Similar to predicate pushdown, TopN and Limit are pushed down in the execution plan tree to a position as close to the data source as possible so that the required data is filtered at an

execution process of IndexMerge the same as that of IndexLookUp. While the structure appears as a tree, executing the query does not strictly require the child nodes to be completed before the parent nodes document describes the implementation of TopN and Limit operator pushdown. In the TiDB execution plan tree, the LIMIT clause in SQL corresponds to the Limit operator node, and the ORDER BY clause corresponds sorting rule. Similar to predicate pushdown, TopN and Limit are pushed down in the execution plan tree to a position as close to the data source as possible so that the required data is filtered at an

ta- ble: INSERT INTO embedded_documents VALUES (1, 'dog', '[1,2,1]'), (2, 'fish', '[1,2,4]'), (3, 'tree', '[1,0,0]'); The expected output is as follows: 494 Query OK, 3 rows affected (0.15 sec) Records: document | embedding | +----+----------+-----------+ | 1 | dog | [1,2,1] | | 2 | fish | [1,2,4] | | 3 | tree | [1,0,0] | +----+----------+-----------+ 3 rows in set (0.15 sec) Step 5. Perform a vector search +----+----------+---------------------+ | 2 | fish | 0.00853986601633272 | | 1 | dog | 0.12712843905603044 | | 3 | tree | 0.7327387580875756 | +----+----------+---------------------+ 3 rows in set (0.15 sec) The three

ta- ble: INSERT INTO embedded_documents VALUES (1, 'dog', '[1,2,1]'), (2, 'fish', '[1,2,4]'), (3, 'tree', '[1,0,0]'); The expected output is as follows: 489 Query OK, 3 rows affected (0.15 sec) Records: document | embedding | +----+----------+-----------+ | 1 | dog | [1,2,1] | | 2 | fish | [1,2,4] | | 3 | tree | [1,0,0] | +----+----------+-----------+ 3 rows in set (0.15 sec) Step 5. Perform a vector search +----+----------+---------------------+ | 2 | fish | 0.00853986601633272 | | 1 | dog | 0.12712843905603044 | | 3 | tree | 0.7327387580875756 | +----+----------+---------------------+ 3 rows in set (0.15 sec) The three

subsection describes the components in the sample application project. 4.3.2.7.1 Overview The catalog tree for this example project is shown below (some incomprehensible parts are removed): . ￿── pom.xml instance reaches the token-limit limit. • parse: The query statements are parsed into abstract syntax tree (AST). • compile: Execution plans are compiled based on the AST from the parse phase and statistics execution process of IndexMerge the same as that of IndexLookUp. While the structure appears as a tree, executing the query does not strictly require the child nodes to be completed before the parent nodes

default. The Titan engine automatically segregates large values exceeding 32 KB from RocksDB’s LSM Tree, and stores them separately in Titan to optimize the handling of large values. The Titan engine is instance reaches the token-limit limit. • parse: The query statements are parsed into abstract syntax tree (AST). • compile: Execution plans are compiled based on the AST from the parse phase and statistics tidb_session_parse_duration_seconds records the duration of parsing SQL queries to an Abstract Syntax Tree (AST), which can be skipped by PREPARE/EXECUTE state- ments. • tidb_session_compile_duration_seconds

instance reaches the token-limit limit. • parse: The query statements are parsed into abstract syntax tree (AST). • compile: Execution plans are compiled based on the AST from the parse phase and statistics tidb_session_parse_duration_seconds records the duration of parsing SQL queries to an Abstract Syntax Tree (AST), which can be skipped by PREPARE/EXECUTE state- ments. • tidb_session_compile_duration_seconds execution process of IndexMerge the same as that of IndexLookUp. While the structure appears as a tree, executing the query does not strictly require the child nodes to be completed before the parent nodes

Description authentication_ldap_sasl_bind_base_dn �→ Newly added Limits the search scope within the search tree in LDAP SASL authen- tica- tion. If a user is created with- out AS ... clause, TiDB auto- mati- cally authentication_ldap_simple_bind_base_dn �→ Newly added Limits the search scope within the search tree in LDAP simple authen- tica- tion. If a user is created with- out AS ... clause, TiDB will au- tomati- instance reaches the token-limit limit. • parse: The query statements are parsed into abstract syntax tree (AST). • compile: Execution plans are compiled based on the AST from the parse phase and statistics