gudusoft.gsqlparser.ir.semantic

Enum RowLimitKind

Object

Enum<RowLimitKind>

gudusoft.gsqlparser.ir.semantic.RowLimitKind

All Implemented Interfaces:

Serializable, Comparable<RowLimitKind>

public enum RowLimitKind
extends Enum<RowLimitKind>

Surface form of the row-limit metadata captured on a StatementGraph. Slices 70 and 71 cover the four single-SELECT row-limit shapes that do not change column lineage:

• LIMIT — PostgreSQL / MySQL / SQLite / BigQuery / Snowflake / Redshift LIMIT N (count on TLimitClause.getRow_count()) and the inline-offset variants LIMIT N OFFSET M and MySQL/Hive/Informix LIMIT M, N. When offset is present it lands on RowLimit.getOffset().
• FETCH_FIRST — ANSI / Oracle / DB2 / SQL Server FETCH FIRST N ROWS ONLY (and the FETCH NEXT N ROWS ONLY synonym), PostgreSQL FETCH FIRST routed through TLimitClause.getSelectFetchFirstValue(), and Informix FIRST n / SKIP m FIRST n (Informix routes FIRST through the same PG slot). When offset is present (PG OFFSET m FETCH FIRST n, Informix SKIP m FIRST n) it lands on RowLimit.getOffset().
• TOP — SQL Server SELECT TOP N. PERCENT and WITH TIES surfaces are rejected separately for now (ROW_LIMIT_TOP_PERCENT_NOT_SUPPORTED, ROW_LIMIT_TOP_WITH_TIES_NOT_SUPPORTED).
• OFFSET_FETCH — Oracle / SQL Server OFFSET m ROWS [FETCH NEXT n ROWS ONLY] routed through the dedicated TOffsetClause + TFetchFirstClause AST pair, and PG's OFFSET m offset-only shape routed through TLimitClause.getOffset() when row_count is null. RowLimit.getCount() may be null for offset-only forms.

Set-op outer row-limit (e.g. UNION ALL ... LIMIT 5) is still rejected by rejectSetOpRowLimit with SET_OP_ROW_LIMIT_NOT_SUPPORTED; slice 72 lifts it. Branch-level row-limit inside a set-op (e.g. (SELECT ... LIMIT 10) UNION ALL (SELECT ... LIMIT 5)) admits per branch — each branch's StatementGraph carries its own RowLimit.

Enum Constant Summary

Enum Constants

Enum Constant and Description
FETCH_FIRST
LIMIT
OFFSET_FETCH
TOP

Method Summary

Modifier and Type	Method and Description
static RowLimitKind	valueOf(String name) Returns the enum constant of this type with the specified name.
static RowLimitKind[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

LIMIT

public static final RowLimitKind LIMIT

FETCH_FIRST

public static final RowLimitKind FETCH_FIRST

TOP

public static final RowLimitKind TOP

OFFSET_FETCH

public static final RowLimitKind OFFSET_FETCH

Method Detail

values

public static RowLimitKind[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (RowLimitKind c : RowLimitKind.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static RowLimitKind valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null