AST Nodes
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AST (Abstract Syntax Tree) nodes represent parsed TLSQL statements. The AST is organized hierarchically:

- **Statements**: Top-level constructs (TRAIN, PREDICT, VALIDATE).
- **Clauses**: Statement components (WITH, FROM, WHERE, VALUE).
- **Expressions**: Conditional and logical expressions.
- **References**: Column and table references.

Base Classes
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.. autoclass:: tlsql.tlsql.ast_nodes.ASTNode
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.. autoclass:: tlsql.tlsql.ast_nodes.Expr
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Column and Reference Classes
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.. autoclass:: tlsql.tlsql.ast_nodes.ColumnReference
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.. autoclass:: tlsql.tlsql.ast_nodes.ColumnSelector
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Expression Classes
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.. autoclass:: tlsql.tlsql.ast_nodes.LiteralExpr
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.. autoclass:: tlsql.tlsql.ast_nodes.ColumnExpr
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.. autoclass:: tlsql.tlsql.ast_nodes.BinaryExpr
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.. autoclass:: tlsql.tlsql.ast_nodes.UnaryExpr
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.. autoclass:: tlsql.tlsql.ast_nodes.BetweenExpr
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.. autoclass:: tlsql.tlsql.ast_nodes.InExpr
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Statement Classes
-----------------

.. autoclass:: tlsql.tlsql.ast_nodes.Statement
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.. autoclass:: tlsql.tlsql.ast_nodes.TrainStatement
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.. autoclass:: tlsql.tlsql.ast_nodes.PredictStatement
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.. autoclass:: tlsql.tlsql.ast_nodes.ValidateStatement
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Clause Classes
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.. autoclass:: tlsql.tlsql.ast_nodes.WithClause
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.. autoclass:: tlsql.tlsql.ast_nodes.TablesClause
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.. autoclass:: tlsql.tlsql.ast_nodes.ValueClause
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.. autoclass:: tlsql.tlsql.ast_nodes.FromClause
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.. autoclass:: tlsql.tlsql.ast_nodes.WhereClause
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.. autoclass:: tlsql.tlsql.ast_nodes.PredictType
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