SubstraitAccumulatorVisitor (AWS Athena Query Federation 2022.47.1 API)

java.lang.Object
- org.apache.calcite.sql.util.SqlBasicVisitor<org.apache.calcite.sql.SqlNode>
- - org.apache.calcite.sql.util.SqlShuttle
  - - com.amazonaws.athena.connector.substrait.SubstraitAccumulatorVisitor

All Implemented Interfaces:

org.apache.calcite.sql.util.SqlVisitor<org.apache.calcite.sql.SqlNode>
```
public class SubstraitAccumulatorVisitor
extends org.apache.calcite.sql.util.SqlShuttle
```
A SqlShuttle-based AST visitor that converts inline-literal SQL into a parameterized form by extracting literals and replacing them with SqlDynamicParam placeholders.
Beyond the standard recursive AST traversal provided by SqlShuttle, this visitor does the following extra work:
- Literal extraction & parameterization: Literals in comparisons (=, <>, >, <, >=, <=), IN, BETWEEN, and LIKE are replaced with ? params. Each extracted value is stored in the accumulator as a SubstraitTypeAndValue.
- Schema-aware type resolution: Literal types are resolved from the column's schema type (not the literal's own type), ensuring correct Substrait type mapping.
- Column context tracking: A columnStack associates literals with their column by pushing column names when visiting identifiers and peeking when visiting literals.
- WHERE clause scoping: An inWhereClause flag is set only during WHERE traversal to enable boolean-specific handling without affecting other clauses.
- Implicit boolean expansion: Bare boolean column references in WHERE (e.g., WHERE is_active) are expanded to WHERE is_active = ? with TRUE accumulated as the parameter.

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.calcite.sql.util.SqlShuttle
  org.apache.calcite.sql.util.SqlShuttle.CallCopyingArgHandler
- Nested classes/interfaces inherited from class org.apache.calcite.sql.util.SqlBasicVisitor
  org.apache.calcite.sql.util.SqlBasicVisitor.ArgHandler<R extends Object>, org.apache.calcite.sql.util.SqlBasicVisitor.ArgHandlerImpl<R extends Object>

Constructor Summary

Constructors
Constructor Description

SubstraitAccumulatorVisitor(List<SubstraitTypeAndValue> accumulator, org.apache.calcite.rel.type.RelDataType schema)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`org.apache.calcite.sql.SqlNode`	`visit(org.apache.calcite.sql.SqlCall call)`
`org.apache.calcite.sql.SqlNode`	`visit(org.apache.calcite.sql.SqlIdentifier id)`
`org.apache.calcite.sql.SqlNode`	`visit(org.apache.calcite.sql.SqlLiteral literal)`

Methods inherited from class org.apache.calcite.sql.util.SqlShuttle
visit, visit, visit, visit

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.calcite.sql.util.SqlVisitor
visitAll, visitNode

- Constructor Detail
  - SubstraitAccumulatorVisitor
```
public SubstraitAccumulatorVisitor(List<SubstraitTypeAndValue> accumulator,
                                   org.apache.calcite.rel.type.RelDataType schema)
```
- Method Detail
  - visit
```
public org.apache.calcite.sql.SqlNode visit(org.apache.calcite.sql.SqlCall call)
```
    Specified by:
    
    visit in interface org.apache.calcite.sql.util.SqlVisitor<org.apache.calcite.sql.SqlNode>
    
    Overrides:
    
    visit in class org.apache.calcite.sql.util.SqlShuttle
  - visit
```
public org.apache.calcite.sql.SqlNode visit(org.apache.calcite.sql.SqlIdentifier id)
```
    Specified by:
    
    visit in interface org.apache.calcite.sql.util.SqlVisitor<org.apache.calcite.sql.SqlNode>
    
    Overrides:
    
    visit in class org.apache.calcite.sql.util.SqlShuttle
  - visit
```
public org.apache.calcite.sql.SqlNode visit(org.apache.calcite.sql.SqlLiteral literal)
```
    Specified by:
    
    visit in interface org.apache.calcite.sql.util.SqlVisitor<org.apache.calcite.sql.SqlNode>
    
    Overrides:
    
    visit in class org.apache.calcite.sql.util.SqlShuttle