Sqlglot optimizer

Sqlglot optimizer. qualify_tables import qualify_tables from sqlglot. helper import is_date_unit , is_iso_date , is_iso_datetime 8 9 10 def canonicalize ( expression : exp . defnodes_for_predicate(predicate, sources, scope_ref_count):View Source. It aims to read a wide variety of SQL inputs and output syntatically correct SQL in the targeted dialects. 0 sqlglotrs==0. helper import find_new_name 5 from 1 from collections import defaultdict 2 3 from sqlglot import alias, exp 4 from sqlglot. Use the subtraction and addition properties of equality to simplify expressions: x + 1 = 3 becomes x = 2. simplifying CAST(<integer literal> AS <integer type>) when present in binary expressions, which would also enable Ibis to statically analyze these conditions. scope import ScopeType, traverse_scope 4 5 6 def unnest_subqueries (expression): 7 """ 8 Rewrite sqlglot AST to convert some predicates with subqueries into joins. I remember stumbling on a question that aske Hi everyone, This is an interesting problem. It can be used to format SQL or translate between 21 different dialects like DuckDB , Presto / Trino , Spark / Databricks , Snowflake , and BigQuery . qualify_columns import qualify_outputs # We keep track of the unaliased column projection indexes instead of the expressions # themselves, because the latter are going to be replaced by new nodes when the aliases Nov 28, 2022 · Toggle navigation. Scope is indeed the way to do this: import sqlglot from sqlglot import expressions as exp from sqlglot. qualify_columns import Resolver 5 from sqlglot. simplify import simplify >>> from sql Mar 21, 2023 · Short Description When using a select along with a with statement, that has an embedded subquery, the optimizer gets confused. Oct 2, 2022 · 1. effective_start_date <= TRUNC(t2. sqlglot. Jul 29, 2023 · sqlglot is a Python package that serves as a comprehensive SQL parser, transpiler, optimizer, and engine. TYPE_CHECKING: Expression: 157 """Remove references to unnest table aliases, added by the optimizer's qualify_columns step. 17. py","contentType":"file SQLGlot is a no-dependency SQL parser, transpiler, optimizer, and engine. source_columns. There is a lot of work in the Python ecosystem around high performance vectorized computation, which I think could benefit from a pure Python-based AST / plan . customers rather than at the columns from the CTE called customers. com/sqlglot. parse_one('SELECT Bar. optimizer import optimize I think it needs to be added to __init__. Workaround query = """ SELECT x. diale Hi Team, I think I&#39;m facing a bug or I&#39;m doing something wrong, because when I run the optimizer, unused left joins aren&#39;t being removed. 0-1 MIGRATED to testing (Debian testing watch) DataType:434"""435Convert a type represented as a string to the corresponding `sqlglot. helper import Dec 3, 2023 · Cool Functionalities of Sqlglot:. Dialect class implements a generic dialect that aims to be as universal as possible. sql() 11 'SELECT * FROM x CROSS JOIN y sqlglot. py","path":"sqlglot/optimizer/__init__. You'd need to remove aliases from sources and rename the tables of columns as you go. sql (pretty=True) to your final DataFrame command to return a list of sql statements to run that command. third_table AS t3 WHERE t3. SELECT * FROM x where Hello @tobymao & team - apologies if this is not the right place to ask this question! I am using the qualify function of sqlglot using the BigQuery dialect like so: ast = parse_one(ddl,dialect="bi A web app to optimize and lint SQL queries using sqlglot and sqlfmt. errors import ErrorLevel, ParseError, concat_messages, merge_errors 9 from sqlglot. Ex: sqlglot. Trino does not have qualify. e. optimizer import optimize from sqlglot. qualify_columns import qualify_columns, validate_qualify_columns from sqlglot. Sign in Saved searches Use saved searches to filter your results more quickly TableAlias) 255 and not alias. Schema` or a mapping in one of the following forms: 1. {db: {table: {col: type}}} 3. I was considering an initial prototype with reduced scope for now e. some_schema. from sqlglot import parse_one from sqlglot. - jtalmi/sql-optimizer-app Jan 13, 2024 · Hey @billstark, I looked into this and it turns out it's rather complicated to solve. 161 """ 162 if not offset or len (expressions)!= 1: 163 return expressions 164 165 expression = expressions [0] 166 167 from sqlglot import exp 168 from sqlglot. This is a necessary step for most of the optimizer's rules to work; do not set to False unless you know what you're doing! infer_schema: Whether to infer the schema if missing. scope import Scope, traverse_scope 6 from sqlglot. optimizer import optimize. The Search for a Solution When it comes to any diffing tool (not just a semantic one), the primary challenge is to match as many elements of compared entities as possible. The base sqlglot. htmlResources What Is a SQL Dial Edit on GitHub sqlglot. a AND y. optimize_joins View Source. code: import sqlglot. a; """ Does not unnest, fails SQLGlot is a no-dependency SQL parser, transpiler, optimizer, and engine. A AS A FROM "Foo". c2, t2. helper import apply_index_offset, ensure_list, seq_get 10 from sqlglot. schema is respected in duckdb, but not snowflake or bigquery? Let me know if I'm using the API incorrectly. optimizer API Documentation. We implement all our logic in SQL, and then use SQLGlot to transpile to the target execution engine. 440441Returns:442The resulting expression type. b FROM y, z WHERE x. It aims to read a wide variety of SQL inputs and output syntactically and semantically correct SQL in the targeted dialects. SQLGlot. sql (pretty=True) SQLGlot bridges all the different variations, called "dialects", with an extensible SQL transpilation framework. b AND y. Currently the only exception is when caching DataFrames which isn't supported in other dialects. optimizer import optimize query = """ select pt. Code base _frozen_importlib. _DeadlockError: deadlock detected by _ModuleLock('sqlglot. optimizer from sqlglot. Scope is a good way to do this: from sqlglot import expressions as exp from sqlglot. 2 import traceback from sqlglot import SQLGlot is a no dependency Python SQL parser, transpiler, optimizer, and engine. parse_one(""" select sum(A) as sumA, CAST(number as INT) from x order by number """ ), schema={"x SQLGlot is a no-dependency SQL parser, transpiler, optimizer, and engine. It aims to read a wide variety of SQL inputs and output syntactically correct SQL in the targeted dialects. SELECT * FROM (SELECT * FROM x) WHERE z = 1. where(inner_predicate,copy=False) If the predicates are in DNF form, we can only push down conditions that are in all blocks. In most cases a single SQL statement is returned. We should be removing these so that the optimized SQL only includes CTEs that are actually used. helper import name_sequence 3 from sqlglot. If the provided 160 `expressions` argument contains more than one expression, it's returned unaffected. can be optimized into. 9 10 Convert scalar subqueries into cross joins. Which are the best open-source Optimizer projects? This list will help you: Stacer, sqlglot, pytorch-optimizer, image-optimizer, RAdam, sam, and VTIL-Core. 1. 3. There are two binary operations in the above expression: + and = Here's how we reference all the operands in the code below: l r x + 1 = 3 a b. annotate_types import annotate_types 169 from sqlglot. sometimes can reproduce. 436437Args:438schema_type: the type we want to convert. person_id AND t3. 9k. a = y. Aug 30, 2021 · SQLGlot is a no-dependency SQL parser, transpiler, optimizer, and engine. >>> from sqlglot. expand_multi_table_selects View Source 1 from sqlglot import exp 2 3 4 def expand_multi_table_selects ( expression ): 5 """ 6 Replace multiple FROM expressions with JOINs. optimizer import Scope, build_scope, find_all_in_scope, normalize_identifiers, qualify from sqlglot. This module contains the implementation of all supported Expression types. The choice of SQLglot was an obvious one due to its simple but powerful API, lack of external dependencies and, more importantly, extensive list of supported SQL dialects. alias 163 for unnest in find_all_in_scope (expression, exp. person_id AS person_id, ( SELECT MAX(t3. putting just a ";" on a line, or just " {", or just "}" etc. 1. Table ) ] I'm the author of SQLGlot. It can be used to format SQL or translate between 20 different dialects like DuckDB, Presto / Trino, Spark / Databricks, Snowflake, and BigQuery. ast = parse_one(sql_query, read The implementation would be able to leverage the parser, optimizer, and logical planner, only needing to implement physical execution. Contribute to tobymao/sqlglot development by creating an account on GitHub. meta case_sensitive */ FROM table. The optimizer does a great job with optimizing the query but with the latest version 11. This can either be an instance of `sqlglot. Additionally, it exposes a number of helper functions, which are mainly used to programmatically build SQL expressions, such as select. 1 from __future__ import annotations 2 3 import logging 4 import typing as t 5 from collections import defaultdict 6 7 from sqlglot import exp 8 from sqlglot. 1 from __future__ import annotations 2 3 import logging 4 import re 5 import typing as t 6 7 from sqlglot import exp, generator, parser, tokens, transforms 8 from sqlglot. scope import ScopeType if t. It can be used to format SQL or translate between 21 different dialects like DuckDB, Presto / Trino, Spark / Databricks, Snowflake, and BigQuery. Code base Fully reproducible code snippet Please include a fully reproducible code snippet or the input sql, dialect, and expected output. {"payload":{"allShortcutsEnabled":false,"fileTree":{"sqlglot/optimizer":{"items":[{"name":"__init__. AggFunc):151node. We've used it to build a FOSS probabilistic data linking library [1] that's capable of executing against a variety of SQL backends (Spark, Presto, DuckDB, Sqlite), significantly widening our potential user base. Can't choose. optimizer Oct 1, 2022 · oozzyy. Returns: The qualified expression. canonicalize View Source 1 from __future__ import annotations 2 3 import itertools 4 import typing as t 5 6 from sqlglot import exp 7 from sqlglot. Notifications Fork 235; Star 2. schema import ensure_schema 7 8 # Sentinel value that means an outer query selecting ALL columns 9 SELECT_ALL = object 10 11 12 # Selection sqlglot. a, SUM(y. Answered by barakalon on Oct 2, 2022. From the official documentation: SQLGlot is a no-dependency SQL parser, transpiler, optimiser, and engine. """ 158 from sqlglot. In this example, the identifier awill not sqlglot. "Nonstandard" sqlglot behavior in ORDER BY: print( optimize( sqlglot. If you look at DuckDB's select. defsimplify_literals(expression, root=True):View Source. optimizer. It can be used to format SQL or translate between different dialects like DuckDB, Presto, Spark, Snowflake, and BigQuery. creation_date) AND t3. py, you'll notice very "generous" use of newlines, e. pushdown_predicates import pushdown_predicates from sqlglot. . Notes: - Currently only handles a single PIVOT or UNPIVOT operator """ schema = ensure_schema (schema) infer_schema = schema. isolate_table_selects; Copyright (c) 2023 Toby Mao built with pdoc Expected behavior: Remove unused left join "sales" from sqlglot import parse_one from sqlglot. having(inner_predicate,copy=False)152else:153node. values () if isinstance ( source, exp. Additionally, we can't remove predicates from their original form. tobymao / sqlglot Public. Dec 7, 2022 · Saved searches Use saved searches to filter your results more quickly May 18, 2023 · Error: sqlglot. some This extension makes vscode seamlessly work with dbt™: Auto-complete, preview, column lineage, AI docs generation, health checks, cost estimation etc - AltimateAI/vscode-dbt-power-user Oct 9, 2022 · Currently if a CTE exists that is not used at all to produce the final result the optimizer leaves it in. b) FROM x, y WHERE x. DataType` object. 5, I'm facing an error where Sep 3, 2021 · SQLGlot is a no dependency Python SQL parser and transpiler. b IN ( SELECT y. And if you want to remove out column aliases and you might have subqueries, you'd Saved searches Use saved searches to filter your results more quickly What is SQLGlot ? Quick Start Guide GH https://github. It can be used to format SQL or translate between different dialects like Presto, Spark, and Hive. {table: {col: type}} 2. 1 import itertools 2 3 from sqlglot import expressions as exp 4 from sqlglot. Investigation. 439dialect: the SQL dialect that will be used to parse `schema_type`, if needed. This supports: SQL formatting; 20 different dialects; Dialect conversion Normalize all unquoted identifiers to either lower or upper case, dependingon the dialect. . From debugging a bit sqlglot, it looks like at some point in the code resolver. Unnest) 164 if isinstance (unnest sqlglot. 1 from sqlglot import exp 2 3 4 def lower_identities (expression): 5 """ 6 Convert all unquoted identifiers to lower case. 11 Convert correlated or vectorized May 10, 2024 · SQLGlot is a no-dependency SQL parser, transpiler, optimizer, and engine. It is designed to read a wide variety of SQL inputs and output syntactically and semantically correct SQL in the targeted dialects. Scope has methods for tracing query "sources" to all their columns (see Scope. 1 from __future__ import annotations 2 3 import typing as t 4 5 from sqlglot import exp 6 from sqlglot. full_name) AS _col_0 FROM db. And it's flaky. postgres): pr Related to this issue: #93 Is there an easy way, to support Trino SQL execution with Catalog and Schema? Example code: from sqlglot. qualify count(*) over (partition by product_id) > 1. Complex queries can often be cumbersome. my_schema1. from product_sales. sources. SQLGlot elegantly trims unnecessary parts, as demonstrated below: from sqlglot import parse_one from sqlglot. 479480This is helpful for optimizing queries, where we need more information than481the expression tree itself. It can be used to format SQL or translate between 20 different dialects like DuckDB , Presto , Spark , Snowflake , and BigQuery . scope') at 140567372050352. 4. You can find a complete source code in the diff. scope import traverse_scope from sqlglot Aug 24, 2023 · SQLGlot is a no-dependency SQL parser, transpiler, optimizer, real engine. 548defsimplify_literals(expression,root SQLGlot's parser handles a superset of SQL, so it's much more flexible than any one engine. Jul 4, 2022 · SQLGlot is great. 477478"Scope" represents the current context of a Select statement. parse_one ( "SELECT " physical_columns = [. source for scope in traverse_scope ( expression ) for source in scope. Select): 161 unnest_aliases = {162 unnest. Code; Issues 0; GeorgeSittas merged 1 commit into main from jo/optimizer_date_simplify_fixes Jan 12 Dec 14, 2023 · Saved searches Use saved searches to filter your results more quickly When using CAST(col AS datetime/timestamp/date [at least this ones there may be more]) + INTERVAL the optimizer gives some errors if cast to datetime (eg. [2023-11-01] sqlglot 18. empty if Dec 18, 2023 · I'm looking for some help on ideas to expand "*" in the Select expression, perhaps referencing a schema argument, and replacing it with list of columns. List[Scope]:475"""476Traverse an expression by its "scopes". For example. 7 8 Example: 9 >>> from sqlglot import parse_one 10 >>> expand_multi_table_selects(parse_one("SELECT * FROM x, y")). duckdb)/timestamp (eg. This essentially makes those identifiers case-insensitive. from sqlglot. dialect import (9 Dialect, 10 NormalizationStrategy, 11 arg_max_or_min_no_count, 12 binary_from_function, 13 date_add_interval_sql, 14 datestrtodate_sql, 15 build Welcome to the SQL Optimizer Streamlit App! This web application is designed to optimize and lint SQL queries effortlessly, leveraging the power of sqlglot for optimization and sqlfmt for linting. SQLGlot is a no-dependency SQL parser, transpiler, optimizer, and engine. bigquery View Source. c = z. 9 10 Example: 11 >>> import sqlglot 12 >>> expression = sqlglot. com/tobymao/sqlglot?tab=readme-ov-fileDocs https://sqlglot. It is a very comprehensive generic We would like to show you a description here but the site won’t allow us. [. input: select *. time import format_time 11 from sqlglot Sep 25, 2023 · SQLGlot is a no-dependency SQL parser, transpiler, optimizer, and engine. 94 95 Example: 96 >>> import sqlglot 97 >>> expression = sqlglot. 1 from sqlglot import exp 2 from sqlglot. dataframe. py The text was updated successfully, but these errors were encountered: _frozen_importlib. 7 8 Assuming the schema is all lower case, this essentially makes identifiers case-insensitive. Each SQL variation has its own Dialect subclass, extending the corresponding Tokenizer, Parser and Generator from sqlglot. Bar') 13 >>> lower Expression, dnf: bool = False)-> int: 90 """ 91 The difference in the number of predicates between a given expression and its normalized form. scope import traverse_scope. It can be used to format SQL or translate between 19 different dialects like DuckDB, Presto, Spark, Snowflake, and BigQuery. pushdown_projections import pushdown Dec 14, 2023 · Saved searches Use saved searches to filter your results more quickly Edit on GitHub sqlglot. SQL can be optimized relatively easily compared to a programming language because it is declarative. selected_sources and Scope. Partially explains the difference I suppose. - shubhusion/sql-optimizer-app Oct 22, 2023 · Saved searches Use saved searches to filter your results more quickly Mar 18, 2024 · Which are best open-source Optimizer projects in Python? This list will help you: sqlglot, pytorch-optimizer, RAdam, sam, cvxportfolio, scour, and Adan. Answered by barakalon on Oct 1, 2022. get_source_columns(column_table) looks for the column in my_db1. It is currently the fastest pure-Python SQL parser. Feb 5, 2023 · This means it starts at the leaves of the query tree. effective_end_date >= TRUNC(t2. select('id', 'sub_type'). dialects. The implementation discussed in this post is now a part of the SQLGlot library. creation_date) ) AS person_full_name from parent_table as pt, second_table as t2 SQL-Tools. errors. parse_one("(a AND b) OR (c AND d)") 98 Expressions. Every AST node in SQLGlot is represented by a subclass of Expression. c ) GROUP BY x. 92 93 This is used as an estimate of the cost of the conversion which is exponential in complexity. what's after the IN part) and and some others ("implicit columns") that exist in the schema of the pivoted table but don't appear in the AST of the PIVOT operator. py module. fro Converting qualify from snowflake to trino does not work. It's possible to make this a no-op by adding a special comment next to theidentifier of interest: SELECT a /* sqlglot. OptimizeError: Unknown column: customer_id. qualify_columns import qualify_outputs 258 259 # We keep track of the unaliased column projection indexes instead of the expressions 260 # themselves, because the latter are going to be replaced by new nodes when the aliases 261 # are added and hence we won't be able to Add sqlglot. It can be former until format SQL or translate between 19 different dialects like DuckDB , Presto , Ignition , Snowflake , and BigQuery . scope import exp >>> from sqlglot. The difficulty stems from the fact that when you pivot a table, you have some columns that are produced as a function of the value list (i. _type_mapping_cache Python SQL Parser and Transpiler. dialect. g. org - Optimizer Source Dialect Source SQL SELECT A OR (B OR (C AND D)) FROM x WHERE Z = date '2021-01-01' + INTERVAL '1' month OR 1 = 0 Fully reproducible code snippet import pandas as pd import sqlglot import time import os from sqlglot import parse_one, exp, optimizer from sqlglot. c for scope in traverse_scope ( ast ) Apr 19, 2024 · SQLGlot is a no-dependency SQL parser, transpiler, optimizer, and engine. scope import traverse_scope ast = sqlglot. eliminate_subqueries View Source. Aug 29, 2023 · Introducing SQLGlot. executor import execute tables = { "some_catalog. columns 256): 257 from sqlglot. schema` will be used db: specify the default database, as might be set by a Oct 13, 2023 · The parse_one function in SQLGlot acts as a keen-eyed interpreter, dissecting a given SQL string and unveiling a syntax tree for the initial parsed SQL statement. person_id = t2. For example, we might care about the source482names within a subquery. exp. Code Snippet The short version (full code provided below): table1_view = Select(). 443"""444ifschema_typenotinself. isolate_table_selects import isolate_table_selects from sqlglot. scope import find_all_in_scope 159 160 if isinstance (expression, exp. Mar 31, 2023 · Hello, I have a slightly long and nested query. Fully reproducible code snippet pip freeze | grep sqlglot sqlglot==23. b = y. sqlglot SQL parser, transpiler, and optimizer for Python. parser View Source. optimizer. {catalog: {db: {table: {col: type}}}} If no schema is provided then the default schema defined at `sqlgot. Optimizing SQL is quite common and means things like projection / predicate push downs and logical simplification. ss wx hc qa uv zs kf bl ut xn