matchSpan

matchSpan(textCol, span, slop)

textCol is the column to be searched, i.e., the column with text indexing set in the PKEY engine.

span is a STRING scalar specifying the phrase to search for, which is order-sensitive.

slop is a non-negative integer specifying the number of extra words allowed before, after, or within the specified phrase.

Perform flexible text searches on the column with text indexing set in the PKEY engine. This function is used in the where clause of a SQL statement.

Return value: Rows containing the specified phrase with no more than slop extra words (excluding stop words) before, after, or within it.

// Generate data for queries
stringColumn = ["There are some apples and oranges.","Mike likes apples.","Alice likes oranges.","Mike gives Alice an apple.","Alice gives Mike an orange.","John likes peaches, so he does not give them to anyone.","Mike, can you give me some apples?","Alice, can you give me some oranges?","Mike traded an orange for an apple with Alice."]
t = table([1,1,1,2,2,2,3,3,3] as id1, [1,2,3,1,2,3,1,2,3] as id2, stringColumn as remark) 
if(existsDatabase("dfs://textDB")) dropDatabase("dfs://textDB")
db = database(directory="dfs://textDB", partitionType=VALUE, partitionScheme=[1,2,3], engine="PKEY")
pt = createPartitionedTable(dbHandle=db, table=t, tableName="pt", partitionColumns="id1",primaryKey=`id1`id2,indexes={"remark":"textindex(parser=english, lowercase=true, stem=true)"})
pt.tableInsert(t)

// Search for rows containing phrase "mike apple", allowing up to 3 extra words (excluding stop words) before, after, or within the phrase
select * from pt where matchSpan(remark, "mike apple", 2)