Package dev.frostlake.executor.commands

Class ColumnDefinitionParser

java.lang.Object

dev.frostlake.executor.commands.ColumnDefinitionParser

All Implemented Interfaces:

CommandHandler

public class ColumnDefinitionParser
extends Object
implements CommandHandler

Parses column / data-type / constraint / default-value grammar into metastore models — extracted from DDLCommandHandler (CREATE TABLE, CREATE FUNCTION/PROCEDURE parameters, DROP FUNCTION arg types, ALTER) so those handlers share one parser. Implements CommandHandler only to reuse its default getText/extractComment helpers; the parsing itself is stateless.

Constructor Summary

Constructors

Constructor	Description
ColumnDefinitionParser(Catalog catalog, QueryExecutor queryExecutor)

Method Summary

Modifier and Type	Method	Description
CheckConstraint	buildCheckConstraint(FrostlakeParser.ConstraintNameContext nameCtx, FrostlakeParser.BooleanExprContext expr, List<String> columnNames)	One CHECK constraint from its parse tree: the expression kept as written, an unnamed one given the auto-generated name live reports it under, and the columns it names read from the tree.
Catalog	getCatalog()	Get catalog instance
QueryExecutor	getQueryExecutor()	Get query executor instance
List<CheckConstraint>	parseCheckConstraints(FrostlakeParser.ColumnListContext ctx, List<String> columnNames)	Every CHECK constraint a column list declares, in declaration order — the column-level ones as their columns appear, then the table-level ones.
List<TableColumn>	parseColumnList(FrostlakeParser.ColumnListContext ctx)
DataType	parseDataType(FrostlakeParser.DataTypeNameContext ctx)
DataType	parseDataType(FrostlakeParser.DataTypeNameContext ctx, FrostlakeParser.TypeParametersContext typeParams)
Object	parseDefaultExpression(FrostlakeParser.DefaultExpressionContext ctx)
List<ForeignKeyConstraint>	parseForeignKeys(FrostlakeParser.ColumnListContext ctx)
Object	parseLiteral(FrostlakeParser.LiteralContext ctx)
Parameter	parseParameterDef(FrostlakeParser.ParameterDefContext p)
Parameter	parsePolicyParameterDef(FrostlakeParser.ParameterDefContext p)	A POLICY signature's parameter.
String	parsePrimaryKeyConstraintName(FrostlakeParser.ColumnListContext ctx)	The name an explicit table-level CONSTRAINT <name> PRIMARY KEY (...) gave the key, or null when it was declared without one (or only as a column-level PRIMARY KEY).
TableColumn	parseSingleColumnDef(FrostlakeParser.ColumnDefContext colDef)	Build a single TableColumn from one columnDef — its data type plus column-level constraints (PRIMARY KEY, NOT NULL, UNIQUE, AUTOINCREMENT/IDENTITY, DEFAULT, column-level REFERENCES, COLLATE, COMMENT).
TableColumn	parseSingleColumnDef(FrostlakeParser.ColumnDefContext colDef, boolean addColumn)	As above, with addColumn telling which surface asked.
List<UniqueConstraint>	parseUniqueConstraints(FrostlakeParser.ColumnListContext ctx)	The table-level UNIQUE constraints of a column list — ONE per declaration, so UNIQUE (a, b) is a single multi-column constraint rather than one constraint per column.
static void	rejectDuplicateNames(List<String> names)	The same rule over bare NAMES, for the lists that carry no types — a CTAS's names-only list and a view's column list, both of which live refuses with this same sentence.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface dev.frostlake.executor.commands.CommandHandler

extractComment, extractComment, getText, getText, qualifiedNameParts

Constructor Details

ColumnDefinitionParser

public ColumnDefinitionParser(Catalog catalog,
 QueryExecutor queryExecutor)

Method Details

getCatalog

public Catalog getCatalog()

Description copied from interface: CommandHandler

Get catalog instance

Specified by:

getCatalog in interface CommandHandler

Returns:

the engine's metastore catalog, holding the objects this handler reads and mutates

getQueryExecutor

public QueryExecutor getQueryExecutor()

Description copied from interface: CommandHandler

Get query executor instance

Specified by:

getQueryExecutor in interface CommandHandler

Returns:

the engine's query executor, for handlers that run nested queries or need session state

parseSingleColumnDef

public TableColumn parseSingleColumnDef(FrostlakeParser.ColumnDefContext colDef)

Build a single TableColumn from one columnDef — its data type plus column-level constraints (PRIMARY KEY, NOT NULL, UNIQUE, AUTOINCREMENT/IDENTITY, DEFAULT, column-level REFERENCES, COLLATE, COMMENT). Shared by CREATE TABLE's parseColumnList(dev.frostlake.parser.FrostlakeParser.ColumnListContext) and ALTER TABLE ADD COLUMN, so both honour DEFAULT / NOT NULL identically. Table-level PRIMARY KEY / FOREIGN KEY constraints are the caller's concern, not this method's.

parseSingleColumnDef

public TableColumn parseSingleColumnDef(FrostlakeParser.ColumnDefContext colDef,
 boolean addColumn)

As above, with addColumn telling which surface asked. It matters for DEFAULTs: CREATE TABLE judges one by COERCION (a string default is refused for the numeric and datetime families, a numeric default for VARCHAR / BOOLEAN / VARIANT, and BOOLEAN DEFAULT 'true' is taken), while ALTER TABLE ADD COLUMN judges the same default far more strictly, in the INSERT surface's own vocabulary. Only the CREATE rule is enforced here — see the ADD COLUMN task for the rest.

rejectDuplicateNames

public static void rejectDuplicateNames(List<String> names)

The same rule over bare NAMES, for the lists that carry no types — a CTAS's names-only list and a view's column list, both of which live refuses with this same sentence.

parseColumnList

public List<TableColumn> parseColumnList(FrostlakeParser.ColumnListContext ctx)

parsePrimaryKeyConstraintName

public String parsePrimaryKeyConstraintName(FrostlakeParser.ColumnListContext ctx)

The name an explicit table-level CONSTRAINT <name> PRIMARY KEY (...) gave the key, or null when it was declared without one (or only as a column-level PRIMARY KEY). A table has at most one primary key, so the first such declaration wins.

parseUniqueConstraints

public List<UniqueConstraint> parseUniqueConstraints(FrostlakeParser.ColumnListContext ctx)

The table-level UNIQUE constraints of a column list — ONE per declaration, so UNIQUE (a, b) is a single multi-column constraint rather than one constraint per column. Unnamed ones auto-name themselves; column-level UNIQUE declarations are not returned here (they are plain column flags and Table names them itself).

parseCheckConstraints

public List<CheckConstraint> parseCheckConstraints(FrostlakeParser.ColumnListContext ctx,
 List<String> columnNames)

Every CHECK constraint a column list declares, in declaration order — the column-level ones as their columns appear, then the table-level ones. GET_DDL renders them all as table-level lines whichever way they were written (live-verified), so both forms land in the same list here.

Parameters:

ctx - the parsed column list

columnNames - the table's column names, to work out which columns each expression names

buildCheckConstraint

public CheckConstraint buildCheckConstraint(FrostlakeParser.ConstraintNameContext nameCtx,
 FrostlakeParser.BooleanExprContext expr,
 List<String> columnNames)

One CHECK constraint from its parse tree: the expression kept as written, an unnamed one given the auto-generated name live reports it under, and the columns it names read from the tree.

parseForeignKeys

public List<ForeignKeyConstraint> parseForeignKeys(FrostlakeParser.ColumnListContext ctx)

parsePolicyParameterDef

public Parameter parsePolicyParameterDef(FrostlakeParser.ParameterDefContext p)

A POLICY signature's parameter. Identical to parseParameterDef(dev.frostlake.parser.FrostlakeParser.ParameterDefContext) but for one measured detail: a string type declared without a length is 128MB wide here, not the column default — live reports a bare VARCHAR policy argument as VARCHAR(134217728) and an explicitly sized one as it was written.

parseParameterDef

public Parameter parseParameterDef(FrostlakeParser.ParameterDefContext p)

parseDataType

public DataType parseDataType(FrostlakeParser.DataTypeNameContext ctx)

parseDataType

public DataType parseDataType(FrostlakeParser.DataTypeNameContext ctx,
 FrostlakeParser.TypeParametersContext typeParams)

parseDefaultExpression

public Object parseDefaultExpression(FrostlakeParser.DefaultExpressionContext ctx)

parseLiteral

public Object parseLiteral(FrostlakeParser.LiteralContext ctx)