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https://issues.apache.org/jira/browse/PHOENIX-7463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Viraj Jasani resolved PHOENIX-7463.
-----------------------------------
Resolution: Fixed
> New ANTLR grammar to evaluate BSON's SQL style expressions
> ----------------------------------------------------------
>
> Key: PHOENIX-7463
> URL: https://issues.apache.org/jira/browse/PHOENIX-7463
> Project: Phoenix
> Issue Type: Improvement
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Fix For: 5.3.0
>
>
> PHOENIX-7330 introduces BSON as Data type in Phoenix. It also introduces
> complex expressions BSON_CONDITION_EXPRESSION() and BSON_UPDATE_EXPRESSION()
> to evaluate various WHERE clause based conditions and to perform full or
> partial document updates.
> BSON_CONDITION_EXPRESSION() has two flavors of expressions:
> # Document style condition expression
> # SQL style condition expression with placeholder values
> The Document style condition expression already comes in AST (Abstract Syntax
> Tree) form and hence the tree is directly parsed to evaluate the given
> condition.
> The SQL style condition expression has statement that needs to be evaluated.
> This style of expressions do have substantial difference from what we use in
> Phoenix SQL based WHERE clause. The expression also has BSON specific
> functions.
> PHOENIX-7330 uses MVEL based expression evaluation language to evaluate the
> given statement. MVEL also internally parses the string into AST tree before
> evaluating it. While this works well, it has some disadvantages:
> * The approach has dependency on regex based string conversions.
> * Adding more internal functions for BSON might require significant changes
> and potentially more regex overhead.
> The purpose of this Jira it to introduce new ANTLR grammar for BSON's SQL
> style condition expressions such that it can be extended to support more
> complex BSON functions in future. ANTLR is a powerful parser framework and it
> is already in use for Phoenix SQL use cases. While the same ANTLR grammar
> rules are not fully applicable to BSON conditions and internal functions
> (e.g. field_exists()), creating new grammar rules for BSON (Document) data
> type should be beneficial.
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