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package simpledb;

/** A LogicalFilterNode represents the parameters of a filter in the WHERE clause of a query.

<p>

Filter is of the form t.f p c

<p>

Where t is a table, f is a field in t, p is a predicate, and c is a constant

*/

public class LogicalFilterNode {

/** The alias of a table (or the name if no alias) over which the filter ranges */

public String tableAlias;

/** The predicate in the filter */

public Predicate.Op p;

/* The constant on the right side of the filter */

public String c;

/** The field from t which is in the filter. The pure name, without alias or tablename*/

public String fieldPureName;

public String fieldQuantifiedName;

public LogicalFilterNode(String table, String field, Predicate.Op pred, String constant) {

tableAlias = table;

p = pred;

c = constant;

String[] tmps = field.split("[.]");

if (tmps.length>1)

fieldPureName = tmps[tmps.length-1];

else

fieldPureName=field;

this.fieldQuantifiedName = tableAlias+"."+fieldPureName;

}

}